docs: make warning more visible (#8661)

* docs: make warning more visible

* docs: update warning style for v22 snd 23

docs/JestObjectAPI.md

@@ -272,7 +272,7 @@ jest.mock(
 );
 ```
 
-_Warning: Importing a module in a setup file (as specified by `setupTestFrameworkScriptFile`) will prevent mocking for the module in question, as well as all the modules that it imports._
+> **Warning:** Importing a module in a setup file (as specified by `setupTestFrameworkScriptFile`) will prevent mocking for the module in question, as well as all the modules that it imports.
 
 Modules that are mocked with `jest.mock` are mocked only for the file that calls `jest.mock`. Another file that imports the module will get the original implementation even if it runs after the test file that mocks the module.
 

website/versioned_docs/version-22.x/JestObjectAPI.md

@@ -326,7 +326,7 @@ jest.mock(
 );
 ```
 
-_Warning: Importing a module in a setup file (as specified by `setupTestFrameworkScriptFile`) will prevent mocking for the module in question, as well as all the modules that it imports._
+> **Warning:** Importing a module in a setup file (as specified by `setupTestFrameworkScriptFile`) will prevent mocking for the module in question, as well as all the modules that it imports.
 
 Modules that are mocked with `jest.mock` are mocked only for the file that calls `jest.mock`. Another file that imports the module will get the original implementation even if it runs after the test file that mocks the module.
 

website/versioned_docs/version-23.x/JestObjectAPI.md

@@ -327,7 +327,7 @@ jest.mock(
 );
 ```
 
-_Warning: Importing a module in a setup file (as specified by `setupTestFrameworkScriptFile`) will prevent mocking for the module in question, as well as all the modules that it imports._
+> **Warning:** Importing a module in a setup file (as specified by `setupTestFrameworkScriptFile`) will prevent mocking for the module in question, as well as all the modules that it imports.
 
 Modules that are mocked with `jest.mock` are mocked only for the file that calls `jest.mock`. Another file that imports the module will get the original implementation even if it runs after the test file that mocks the module.
 

website/versioned_docs/version-24.0/JestObjectAPI.md

@@ -273,7 +273,7 @@ jest.mock(
 );
 ```
 
-_Warning: Importing a module in a setup file (as specified by `setupTestFrameworkScriptFile`) will prevent mocking for the module in question, as well as all the modules that it imports._
+> **Warning:** Importing a module in a setup file (as specified by `setupTestFrameworkScriptFile`) will prevent mocking for the module in question, as well as all the modules that it imports.
 
 Modules that are mocked with `jest.mock` are mocked only for the file that calls `jest.mock`. Another file that imports the module will get the original implementation even if it runs after the test file that mocks the module.