FindMFC:
- Synced module documentation with other similar find modules.
- Added examples section.
- Added reference link to CMAKE_MFC_FLAG variable.
CMAKE_MFC_FLAG:
- Added separate examples section.
- Mentioned FindMFC module.
- Used target_compile_definitions() instead of add_definitions().
Improve formatting, primarily by:
* Adding links to relevant commands, properties, generators, and so on.
* Converting code, symbols, paths, and so on to fixed-width fonts.
* Hard wrapping lines to 80 characters or less.