[Docs]: fix "Test with predefined time" sections in non-Node.js docs #36388
Description
Page(s)
- https://playwright.dev/python/docs/clock#test-with-predefined-time
- https://playwright.dev/java/docs/clock#test-with-predefined-time
- https://playwright.dev/dotnet/docs/clock#test-with-predefined-time
Description
The mentioned sections contain only HTML, but they should also contain code snippets, the same as in docs for Node.js: https://playwright.dev/docs/clock#test-with-predefined-time.