[utest]: [signal]: Add Standardized function comment blocks. (#10914)

* [utest]: [signal]:Standardized function comment blocks have been added.

Added comments to the utest for the signal module, including: test purpose,
usage scenarios, dependency configurations, expected outcomes, and expected
behaviors.

Signed-off-by: Mengchen Teng <[email protected]>

* [utest]: [signal]:Correct issues including grammatical errors, spelling mistakes, and ambiguities in function names.

Fixed the issue of grammatical errors in words; changed the variable 'recive_sig' to 'receive_sig'.
Originally, rt_signal_unmask_test was testing the masking function of rt_signal_mask, while
rt_signal_mask_test was verifying whether signals could be sent correctly during unmasking——the
function names were exactly opposite to their functions. Now the two function names have been swapped,
and the corresponding comments have also been updated accordingly.After modification, it has been
verified that the signal-related utests can be executed correctly.

Signed-off-by: Mengchen Teng <[email protected]>

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Signed-off-by: Mengchen Teng <[email protected]>

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