Peter Kokot 62c121163d CheckVariableExists: Update documentation ...

- Added intro code block showing how to include this module.
- Added examples section.
- Added missing CMAKE_REQUIRED_LINK_DIRECTORIES variable (this module
  can also use it as of CMake 3.31).
- Added a note that this is a linker only check and it doesn't check
  whether the variable is also declared in headers, unlike
  check_symbol_exists().
- Added "See Also" section.

2025-05-21 00:41:47 +02:00

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