merge with recent branch

Author: SoldierSacha

src/mcp/server/auth/handlers/register.py

@@ -81,8 +81,9 @@ async def handle(self, request: Request) -> Response:
                 content=RegistrationErrorResponse(
                     error="invalid_client_metadata",
                     error_description=(
-                        "grant_types must include authorization_code and refresh_token, "
-                        "client_credentials, token_exchange, or client_credentials and token_exchange"
+                        "grant_types must be authorization_code and refresh_token "
+                        "or client_credentials or token exchange or "
+                        "client_credentials and token_exchange"
                     ),
                 ),
                 status_code=400,