Fix some minor typos (#907)

maintenace -> maintenance
Maintainance -> Maintenance

Author: jdufresne

gh-labels.rst

@@ -103,7 +103,7 @@ expert-asyncio
 
 invalid
     Used manually for PRs that do not meet basic requirements and
-    automatically added by bedevere when PR authors attempt to merge maintenace
+    automatically added by bedevere when PR authors attempt to merge maintenance
     branches into the main branch. During events such as the October
     Hacktoberfest, this label will prevent the PR from counting toward the
     author's contributions.

setup.rst

@@ -478,7 +478,7 @@ install your own copy of Autoconf.
 Regenerate the ABI dump
 =======================
 
-Maintainance branches (not ``main``) have a special file located in
+Maintenance branches (not ``main``) have a special file located in
 ``Doc/data/pythonX.Y.abi`` that allows us to know if a given Pull Request
 affects the public ABI. This file is used by the GitHub CI in a check
 called ``Check if the ABI has changed`` that will fail if a given Pull Request