Help: Fix preset example cmakeMinimumRequired
CMake 3.20.0 can't open v3 presets.
Make cmakeMinimumRequired compatible with the example's version.
Backport: release
Topic-rename: doc-preset-example-v3
Edited by Brad King
CMake 3.20.0 can't open v3 presets.
Make cmakeMinimumRequired compatible with the example's version.
Backport: release
Topic-rename: doc-preset-example-v3