build: fix typo in Makefile

PR-URL: #36176
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

Author: RaisinTen

Makefile

@@ -1345,7 +1345,7 @@ lint-py:
 	PYTHONPATH=tools/pip $(PYTHON) -m flake8 --count --show-source --statistics .
 else
 lint-py:
-	$(warning Python linting with flake8 is not avalible)
+	$(warning Python linting with flake8 is not available)
 	$(warning Run 'make lint-py-build')
 endif