Merge pull request matplotlib#19313 from timhoffm/doc-verticalalignment

Add missing possible return value to docs of get_verticalalignment()

Author: anntzer

lib/matplotlib/text.py

@@ -849,7 +849,7 @@ def get_text(self):
     def get_verticalalignment(self):
         """
         Return the vertical alignment as a string.  Will be one of
-        'top', 'center', 'bottom' or 'baseline'.
+        'top', 'center', 'bottom', 'baseline' or 'center_baseline'.
         """
         return self._verticalalignment