Adjust news/docs from pylint-dev#8813 to use bad-names-rgx

Author: jacobtylerwalls

doc/data/messages/i/invalid-name/details.rst

@@ -99,7 +99,7 @@ Before pylint 3.0, most predefined patterns also enforced a minimum length
 of three characters. If this behavior is desired in versions 3.0 and following,
 it can be had by providing custom regular expressions as described next. (Or,
 if the ``disallowed-name`` check is sufficient instead of ``invalid-name``,
-providing the single option ``bad-names-rgxs="^..?$"`` will suffice to fail 1-2
+providing the single option ``bad-names-rgx="^..?$"`` will suffice to fail 1-2
 character names.
 
 Custom regular expressions

doc/whatsnew/fragments/2018.user_action

@@ -5,7 +5,7 @@ and name length, and users regularly reported this to be surprising.)
 If checking for a minimum length is still desired, it can be regained in two ways:
 
 - If you are content with a ``disallowed-name`` message (instead of ``invalid-name``),
-then simply add the option ``bad-names-rgxs="^..?$"``, which will fail 1-2
+then simply add the option ``bad-names-rgx="^..?$"``, which will fail 1-2
 character-long names. (Ensure you enable ``disallowed-name``.)
 
 - If you would prefer an ``invalid-name`` message to be emitted, or would prefer