Multiple small changes/fixed typos to docs/error messages (#623)

telethon/telegram_bare_client.py

@@ -455,7 +455,9 @@ class TelegramBareClient:
                 with self._reconnect_lock:
                     self._reconnect()
 
-        raise RuntimeError('Number of retries reached 0.')
+        raise RuntimeError('Number of retries reached 0 for {}.'.format(
+            [type(x).__name__ for x in requests]
+        ))
 
     # Let people use client.invoke(SomeRequest()) instead client(...)
     invoke = __call__