[3.13] gh-144473: Add "steal" term to glossary; clarify "stealing" onerror (GH-144502...

[3.13] gh-144473: Add "steal" term to glossary; clarify "stealing" onerror (GH-144502) (GH-152772) (GH-152779)

With one exception, all "stealing" functions also steal on error,
but it makes sense to note this in each case.

(cherry picked from commit 34503f39532279efb12653754bb3a7e535fb66cc)
(cherry picked from commit f8fb02db9d1d83a2fe4d2a62dfda69a02023b75a)

Co-authored-by: Peter Bierma <zintensitydev@gmail.com>