Remove search endpoint media_type argument

Author: mneagul

pystac_client/client.py

@@ -157,7 +157,6 @@ def search(self, **kwargs: Any) -> ItemSearch:
             If the API does not meet either of these criteria, this method will raise a :exc:`NotImplementedError`.
 
         Args:
-            media_type : Select search endpoint based on the specified `media_type`
             **kwargs : Any parameter to the :class:`~pystac_client.ItemSearch` class, other than `url`, `conformance`,
                 and `stac_io` which are set from this Client instance