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gmessages: Add nullable annotation for `log_domain` in `GLogFunc`

Roberto Leinardi requested to merge leinardi/glib:fix-3552 into main

Add a missing (nullable) annotation for the log_domain parameter in the GLogFunc callback. This ensures consistency with the documentation and usage in functions like g_log_set_handler, where log_domain can be NULL.

Without this annotation, the GIR file generated from the C source does not reflect the nullability of log_domain, leading to potential issues in language bindings and other introspection-based tools.

This change updates the documentation in glib/gmessages.c to include the nullable annotation and clarifies the expected behavior of the GLogFunc callback.

Move details about the log_domain parameter being NULL or an empty string for the default application domain from argument descriptions to the main function descriptions.

This ensures concise argument descriptions while providing a clear explanation of exceptions in the function body.

Fixes #3552 (closed)

Edited by Roberto Leinardi

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