update docs from test snippet changes

docs/content/concepts/assets/software-defined-assets.mdx

@@ -562,7 +562,7 @@ When writing a unit test, use <PyObject object="build_op_context" /> to mock the
 
 ```python file=/concepts/assets/asset_testing.py startafter=start_test_with_context_asset endbefore=end_test_with_context_asset
 def test_uses_context():
-    context = build_op_context()
+    context = build_asset_context()
     result = uses_context(context)
     assert result == "bar"
 ```

docs/content/concepts/testing.mdx

@@ -333,7 +333,7 @@ def test_asset_with_inputs():
 If your asset has a config schema, you can pass a config value to the invocation. The following asset relies on attached config:
 
 ```python file=/concepts/ops_jobs_graphs/unit_tests.py startafter=start_test_config_asset endbefore=end_test_config_asset
-from dagster import asset, Config, build_op_context
+from dagster import asset, Config
 
 
 class MyAssetConfig(Config):
@@ -357,7 +357,7 @@ If your asset requires resources, you can specify them as arguments when invokin
 Consider the following asset, which requires a resource `foo`.
 
 ```python file=/concepts/ops_jobs_graphs/unit_tests.py startafter=start_test_resource_asset endbefore=end_test_resource_asset
-from dagster import asset, ConfigurableResource, build_op_context, with_resources
+from dagster import asset, ConfigurableResource
 
 
 class BarResource(ConfigurableResource):

docs/content/guides/dagster/transitioning-data-pipelines-from-development-to-production.mdx

@@ -400,9 +400,9 @@ Now we can use the stub Hacker News resource to test that the `items` asset tran
 
 
 def test_items():
-    context = build_op_context(
+    context = build_asset_context(
         resources={"hn_client": StubHNClient()},
-        op_config={"N": StubHNClient().fetch_max_item_id()},
+        asset_config={"N": StubHNClient().fetch_max_item_id()},
     )
     hn_dataset = items(context)
     assert isinstance(hn_dataset, pd.DataFrame)