[DOCS] Update docs for UnexpectedRowsExpectation

docs/docusaurus/docs/cloud/expectations/manage_expectations.md

@@ -8,12 +8,6 @@ An Expectation is a verifiable assertion about your data. They make implicit ass
 
 <!-- [//]: # (TODO: To learn more about Expectations, see Expectation.) -->
 
-:::info Custom SQL Query Expectations
-
-To create custom SQL query Expectations, you'll need to use the GX API. See [Customize Expectations](/core/customize_expectations/customize_expectations.md).
-
-:::
-
 ## Prerequisites
 
 - You have a [Data Asset](/cloud/data_assets/manage_data_assets.md#create-a-data-asset).
@@ -23,7 +17,7 @@ To create custom SQL query Expectations, you'll need to use the GX API. See [Cus
 The following table lists the available GX Cloud Expectations.
 
 | Data Quality Issue | Expectation                                               | Description                                                                                                                            |
-| ------------------ | --------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------- |
+|--------------------|-----------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------|
 | Cardinality        | `expect_column_values_to_be_unique`                       | Expect each column value to be unique.                                                                                                 |
 | Cardinality        | `expect_compound_columns_to_be_unique`                    | Expect the compound columns to be unique.                                                                                              |
 | Cardinality        | `expect_select_column_values_to_be_unique_within_record`  | Expect the values for each record to be unique across the columns listed. Note that records can be duplicated.                         |
@@ -69,6 +63,18 @@ The following table lists the available GX Cloud Expectations.
 | Volume             | `expect_table_row_count_to_equal`                         | Expect the number of rows to equal a value.                                                                                            |
 | Volume             | `expect_table_row_count_to_equal_other_table`             | Expect the number of rows to equal the number in another table within the same database.                                               |
 
+## Custom SQL Expectations
+
+GX Cloud also offers the ability to write a custom Expectation using SQL. It is designed to fail validation if the provided SQL query returns one or more rows.
+
+The provided query should be written in the dialect of the Data Source in which a given Data Asset lives.
+
+:::info Optional `{batch}` named query
+
+The optional `{batch}` named query references the Batch of data under test. When the Expectation is evaluated, the `{batch}` named query will be replaced with the Batch of data that is validated.
+
+:::
+
 ## Add an Expectation
 
 1. In GX Cloud, click **Data Assets**.

docs/docusaurus/docs/core/customize_expectations/use_sql_to_define_a_custom_expectation.md

@@ -11,7 +11,7 @@ import PrereqPreconfiguredDataSourceAndAsset from '../_core_components/prerequis
 
 Among the available Expectations, the `UnexpectedRowsExpectation` is designed to facilitate the execution of SQL or Spark-SQL queries as the core logic for an Expectation.  By default, `UnexpectedRowsExpectation` considers validation successful when no rows are returned by the provided SQL query.
 
-You customize an `UnexpectedRowsExpectation` in essentially the same manner as you would [define a custom Expectation](/core/customize_expectations/define_a_custom_expectation_class.md), by subclassing `UnexpectedRowsExpectation` and providing customized default attributes and text for Data Docs. However, there are some caveats around the `UnexpectedRowsExpectation`'s `unexpected_rows_query` attribute that deserve further detail.
+Like any other Expectation, you can instantiate the `UnexpectedRowsExpectation` directly. You can also customize an `UnexpectedRowsExpectation` in essentially the same manner as you would [define a custom Expectation](/core/customize_expectations/define_a_custom_expectation_class.md), by subclassing `UnexpectedRowsExpectation` and providing customized default attributes and text for Data Docs. However, there are some caveats around the `UnexpectedRowsExpectation`'s `unexpected_rows_query` attribute that deserve further detail.
 
 <!-- TODO: Do we want to discuss custom `_validate(...)` logic here, or should that be held for a future topic on building custom Expectation classes from scratch? -->
 
@@ -48,7 +48,7 @@ You customize an `UnexpectedRowsExpectation` in essentially the same manner as y
 
    The `unexpected_rows_query` attribute is a SQL or Spark-SQL query that returns a selection of rows from the Batch of data being validated.  By default, rows that are returned have failed the validation check.
 
-   Although the `unexpected_rows_query` should be written in standard SQL or Spark-SQL syntax, it must also contain the special `{batch}` placeholder.  When the Expectation is evaluated, the `{batch}` placeholder will be replaced with the Batch of data that is validated.
+   The `unexpected_rows_query` should be written in standard SQL or Spark-SQL syntax, except that it can also contain the special `{batch}` named query.  When the Expectation is evaluated, the `{batch}` keyword will be replaced with the Batch of data that is configured for your Data Asset.
 
    In this example, `unexpected_rows_query` will select any rows where the passenger count is greater than `6` or less than `0`.  These rows will fail validation for this Expectation:
 

docs/docusaurus/sidebars.js

@@ -252,6 +252,11 @@ module.exports = {
               label: 'Available Expectations',
               href: '/docs/cloud/expectations/manage_expectations#available-expectations',
             },
+            {
+              type: 'link',
+              label: 'Custom SQL Expectations',
+              href: '/docs/cloud/expectations/manage_expectations#custom-sql-expectations',
+            },
             {
               type: 'link',
               label: 'Add an Expectation',