Fix typos and update excluded/ignored codespell lists.

docs/sudo_plugin_python.man.in

@@ -94,7 +94,7 @@ The customized Plugin class should define a few plugin-specific methods.
 When the plugin loads,
 \fBsudo\fR
 will create an instance of this class and call the methods.
-The actual methods required depent on the type of the plugin,
+The actual methods required depend on the type of the plugin,
 but most return an
 \fIint\fR
 result code, as documented in