[3.7] gh-68966: fix versionchanged in docs (GH-105300)

[3.7] gh-68966: fix versionchanged in docs (GH-105300) · python/cpython@de108bc

Original file line number	Diff line number	Diff line change
`@@ -54,7 +54,7 @@ standard. However, mailcap files are supported on most Unix systems.`
`54`	`54`	use) to determine whether or not the mailcap line applies. :func:`findmatch`
`55`	`55`	`will automatically check such conditions and skip the entry if the check fails.`
`56`	`56`
`57`		`- .. versionchanged:: 3.11`
	`57`	`+ .. versionchanged:: 3.7.16`
`58`	`58`
`59`	`59`	`To prevent security issues with shell metacharacters (symbols that have`
`60`	`60`	special effects in a shell command line), ``findmatch`` will refuse