Update documentation for GetModuleFileName functions

[Or-Fadlon]

Summary

Fix documentation ambiguity in GetModuleFileNameW regarding buffer size behavior when buffer size equals module path length.

Problem

The original documentation stated truncation occurs when path length "exceeds" buffer size, but didn't clearly specify the behavior when they are equal. Testing revealed that even when buffer size exactly equals the path length, truncation still occurs.

Solution

Updated the documentation to specify that truncation occurs when path length "exceeds or equals" the buffer size.

Test Evidence

Test showed:

• Full module path: 50 characters
• Buffer size 50: Resulted in truncation to 48 characters + null terminator
• This confirms that buffer_size == path_length is treated as insufficient

[prmerger-automator]

@Or-Fadlon : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[Karl-Bridge-Microsoft]

Revised. Please make the same update to https://learn.microsoft.com/en-us/windows/win32/api/libloaderapi/nf-libloaderapi-getmodulefilenamea. Thanks!

[Or-Fadlon]

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