Fixed spelling errors in docs.

docs/ref/contrib/postgres/fields.txt

@@ -651,7 +651,7 @@ types.
 
     .. attribute:: form_field
 
-        The form field class to use. Should be a sublcass of
+        The form field class to use. Should be a subclass of
         :class:`django.contrib.postgres.forms.BaseRangeField`.
 
 .. class:: django.contrib.postgres.forms.BaseRangeField

docs/ref/templates/upgrading.txt

@@ -162,7 +162,7 @@ This will load the template with the current engine without triggering the
 multiple template engines machinery, which is usually the desired behavior.
 Unlike previous solutions, this returns a :class:`django.template.Template`,
 like :func:`~django.template.loader.get_template` used to in Django 1.7 and
-earlier, avoiding all backwards-compatibilty problems.
+earlier, avoiding all backwards-compatibility problems.
 
 ``get_template_from_string()``
 ------------------------------

docs/spelling_wordlist

@@ -175,6 +175,7 @@ Dreamhost
 Dreamweaver
 drilldown
 dropdown
+dropdowns
 drupal
 dumpdata
 Dunck
@@ -539,6 +540,7 @@ Roald
 rss
 runfcgi
 runserver
+SaaS
 safeseq
 Sandvik
 savepoint