Link to spring.factories used in the TestContext framework in the ref docs

Closes gh-31723

framework-docs/modules/ROOT/pages/testing/testcontext-framework/ctx-management/context-customizers.adoc

@@ -45,10 +45,10 @@ issue is addressed through support for automatic discovery of default
 Specifically, the modules that make up the testing support in Spring Framework and Spring
 Boot declare all core default `ContextCustomizerFactory` implementations under the
 `org.springframework.test.context.ContextCustomizerFactory` key in their
-`META-INF/spring.factories` properties files. Third-party frameworks and developers can
+{spring-framework-code}/spring-test/src/main/resources/META-INF/spring.factories[`META-INF/spring.factories`]
-contribute their own `ContextCustomizerFactory` implementations to the list of default
+properties files. Third-party frameworks and developers can contribute their own
-factories in the same manner through their own `META-INF/spring.factories` properties
+`ContextCustomizerFactory` implementations to the list of default factories in the same
-files.
+manner through their own `META-INF/spring.factories` properties files.
 
 
 [[testcontext-context-customizers-merging]]

framework-docs/modules/ROOT/pages/testing/testcontext-framework/tel-config.adoc

@@ -82,8 +82,9 @@ issue is addressed through support for automatic discovery of default
 
 Specifically, the `spring-test` module declares all core default `TestExecutionListener`
 implementations under the `org.springframework.test.context.TestExecutionListener` key in
-its `META-INF/spring.factories` properties file. Third-party frameworks and developers
+{spring-framework-code}/spring-test/src/main/resources/META-INF/spring.factories[its
-can contribute their own `TestExecutionListener` implementations to the list of default
+`META-INF/spring.factories` properties file]. Third-party frameworks and developers can
+contribute their own `TestExecutionListener` implementations to the list of default
 listeners in the same manner through their own `META-INF/spring.factories` properties
 file.
 
@@ -207,4 +208,3 @@ Kotlin::
 	}
 ----
 ======
-