Fix typo in multiple-statements message text (#10872)

* Fix typo in multiple-statements message text

* Add news fragment for #10870

* Regenerate docs for multiple-statements message text

* Revert "Add news fragment for #10870"

This reverts commit c3378ff.

Author: u-wlkjyy

doc/user_guide/checkers/features.rst

@@ -553,7 +553,7 @@ Format checker Messages
 :trailing-newlines (C0305): *Trailing newlines*
   Used when there are trailing blank lines in a file.
 :multiple-statements (C0321): *More than one statement on a single line*
-  Used when more than on statement are found on the same line.
+  Used when more than one statement is found on the same line.
 :superfluous-parens (C0325): *Unnecessary parens after %r keyword*
   Used when a single item in parentheses follows an if, for, or other keyword.
 :mixed-line-endings (C0327): *Mixed line endings LF and CRLF*

pylint/checkers/format.py

@@ -92,7 +92,7 @@
     "C0321": (
         "More than one statement on a single line",
         "multiple-statements",
-        "Used when more than on statement are found on the same line.",
+        "Used when more than one statement is found on the same line.",
         {"scope": WarningScope.NODE},
     ),
     "C0325": (