- Refactored module docs sections.
- Used Doxygen_FOUND variable. The uppercased DOXYGEN_FOUND is also set
except it has value of "YES" or "NO".
- Added separate examples section.
- Renamed "Functions" to "Commands".
- Documented doxygen_add_docs() command options as a list for better
overview, and separated the Doxyfile configuration section as part of
the command docs.
- Synced module docs with other similar find modules.
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