Customizer: Increase default priority for a section to 160.

props celloexpressions.
fixes #29172.
Built from https://develop.svn.wordpress.org/trunk@29508


git-svn-id: http://core.svn.wordpress.org/trunk@29285 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Correct the documentation for the customize_save_* action.

props celloexpressions.
see #29165.
Built from https://develop.svn.wordpress.org/trunk@29509


git-svn-id: http://core.svn.wordpress.org/trunk@29286 1a063a9b-81f0-0310-95a4-ce76da25c4cd