docs: Improve wording

Co-authored-by: Mark Sellings <[email protected]>

docs/components/modeler/feel/builtin-functions/feel-built-in-functions-conversion.md

@@ -74,7 +74,7 @@ context([{"key":"a", "value":1}, {"key":"b", "value":2}])
 
 Returns a date from the given value.
 
-Returns `null` if the string is not a valid calendar date, for example, `"2024-06-31"` which is invalid because June has
+Returns `null` if the string is not a valid calendar date. For example, `"2024-06-31"` is invalid because June has
 only 30 days.
 
 **Function signature**
@@ -105,7 +105,7 @@ date(date and time("2012-12-25T11:00:00"))
 
 Returns a date from the given components.
 
-Returns `null` if the components don't represent a valid calendar date, for example, `2024,6,31` which is invalid because
+Returns `null` if the components don't represent a valid calendar date. For example, `2024,6,31` is invalid because
 June has only 30 days.
 
 **Function signature**
@@ -187,7 +187,7 @@ time(14, 30, 0, duration("PT1H"))
 
 Parses the given string into a date and time.
 
-Returns `null` if the string is not a valid calendar date, for example, `"2024-06-31T10:00:00"` which is invalid because
+Returns `null` if the string is not a valid calendar date. For example, `"2024-06-31T10:00:00"` is invalid because
 June has only 30 days.
 
 **Function signature**

docs/components/modeler/feel/builtin-functions/feel-built-in-functions-string.md

@@ -30,7 +30,7 @@ substring("foobar", -2)
 
 ## substring(string, start position, length)
 
-Returns a substring of the given value starting at `start position` with the given `length`. If `length` is greater than
+Returns a substring of the given value, starting at `start position` with the given `length`. If `length` is greater than
 the remaining characters of the value, it returns all characters from `start position` until the end.
 
 **Function signature**

docs/components/modeler/feel/language-guide/feel-temporal-expressions.md

@@ -40,12 +40,11 @@ duration("P3M")
 @"P3M"
 ```
 
-The value is `null` if a date or date and time literal doesn't represent a valid calendar date, for example,
-`@"2024-06-31"` which is invalid because June has only 30 days.
+The value is `null` if a date or date-time literal doesn't represent a valid calendar date. For example, `@"2024-06-31"` is invalid because June has only 30 days.
 
 ### Addition
 
-Adds a value to another value. The operator is defined for the followings types.
+Adds a value to another value. The operator is defined for the following types.
 
 If a value has a different type, the result is `null`.