Minor refactor: Unnecessary use of list() function (#8672)

Author: ahzamm

rest_framework/schemas/inspectors.py

@@ -88,7 +88,7 @@ def get_description(self, path, method):
                                                  view.get_view_description())
 
     def _get_description_section(self, view, header, description):
-        lines = list(description.splitlines())
+        lines = description.splitlines()
         current_section = ''
         sections = {'': ''}