fixup! Add graphviz RST directive

Fixes a doc string typo

Author: mshroyer

pelican/plugins/graphviz/rst_graphviz.py

@@ -29,8 +29,9 @@
 def truthy(argument: str) -> bool:
     """Parse a "truthy" RST option.
 
-    Applies permissive conventions to interpret to interpret "truthy"-looking
-    strings as True, or False otherwise.
+    Applies permissive conventions to interpret "truthy"-looking strings as
+    True, or False otherwise.
+
     """
     return argument.lower() in ("yes", "true", "on", "1")