doc: add missing syntax case to Test Case Groups

[kikofernandez]

ThisPR adds a missing case on how to write test case groups. The missing case is that one can perform function calls at any point of the test case group as long as the result of the function call returns aGroupsAndTestCases` (Syntax for the Erlang TestCaseGroup docs). The following example follows, which is also used in the OTP code:

groups() ->
    [
     {http, [], real_requests()}
   ]

[github-actions[bot]]

CT Test Results

    2 files    58 suites   1h 26m 23s :stopwatch: 442 tests 430 :heavy_check_mark: 12 :zzz: 0 :x: 476 runs  461 :heavy_check_mark: 15 :zzz: 0 :x:

Results for commit e072e71c.

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[kikofernandez]

thanks for the feedback @bjorng , I made the appropriate changes :)