Merge topic 'doc-3.26-relnotes'

385435cf78 Help: Organize and revise 3.26 release notes
4c63f031c1 Help: Consolidate 3.26 release notes
bc1ba6d56b Help: Document experimental feature gate affecting CXX_SCAN_FOR_MODULES
71f9c1943d FindImageMagick: Fix documentation syntax in usage example

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !8148