[3.11] gh-107662: Switch 'any' and 'anext' in functions.rst (GH-107663) (#107665)

gh-107662: Switch 'any' and 'anext' in functions.rst (GH-107663)

Order was reversed in index at top, not in body.
(cherry picked from commit 9ebc6ecbc336d7b17cd158d1a4522f832df3e6e2)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>