Fixed two docstring/comment typos.

django/contrib/admin/options.py

@@ -707,7 +707,7 @@ class ModelAdmin(BaseModelAdmin):
         Exposes almost the same API as messages.add_message(), but accepts the
         positional arguments in a different order to maintain backwards
         compatibility. For convenience, it accepts the `level` argument as
-        a string rather than the ususal level number.
+        a string rather than the usual level number.
         """
 
         if not isinstance(level, int):

docs/conf.py

@@ -16,7 +16,7 @@ from __future__ import unicode_literals
 import sys
 from os.path import abspath, dirname, join
 
-# Make sure we iget the version of this copy of Django
+# Make sure we get the version of this copy of Django
 sys.path.insert(1, dirname(dirname(abspath(__file__))))
 
 # If extensions (or modules to document with autodoc) are in another directory,