Add a small documentation for ApprovalTests

[Harsh4902]

• Added documentation for Approval Test
• Fixes Add a small documentation for ApprovalTests #9658

[Harsh4902]

@murdos How can I fix this formatting error?

[fabienpuissant]

@murdos How can I fix this formatting error?

npm run prettier:format 😃

[pascalgrimaud]

all the code is formatted automatically using husky git hook (after you commit), but you need to launch npm ci the first time you clone the project, then regularly as the dependencies are updated each day

[murdos]

This new documentation is not included in the generated application.
You need to generates it.
Start with completing existing tests for this module, as done with the other similar module:

jhipster-lite/src/test/java/tech/jhipster/lite/generator/server/javatool/pbt/domain/PropertyBasedTestingModuleFactoryTest.java

Line 24 in 3266169

.hasFiles("documentation/property-based-testing.md")

And then make the test pass :) (Hint: study the PropertyBasedTestingModuleFactory to understand what you should do)