Add some more docstrings

Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>

poezio_plugins/omemo/__init__.py

@@ -83,9 +83,11 @@ class Plugin(E2EEPlugin):
         )
 
     def display_error(self, txt) -> None:
+        """Poezio logger Helper"""
         self.api.information(txt, 'Error')
 
     def get_fingerprints(self, jid: JID) -> List[str]:
+        """Return fingerprints for the provided JID"""
         devices = self.core.xmpp['xep_0384'].get_trust_for_jid(jid)
 
         # XXX: What to do with did -> None entries?