Peter Kokot c13351533d FindGettext: Update documentation ...

- Updated module documentation.
- The Gettext_FOUND variable used (CMake 3.3). Uppercased GETTEXT_FOUND
  is also set to the same value by find_package_handle_standard_args().
- Updated all commands and arguments descriptions according to the
  current implementation.
- Moved the gettext_process_po_files() command to top as it seems to
  be a bit more convenient for usage than other two.
- Renamed "functions" to "commands" as some of these are macros and some
  are functions. From the user PoV, knowing whether some module command
  is a macro or a function is mostly irrelevant.
- Added extended examples section showing some basic usage of the module
  commands.

Fixes #16034

2025-05-02 22:31:04 +02:00

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