[1.9.x] Normalized "an SQL" spelling.

Backport of 575a9a791e62de7550761970dc6797271d956c57 from master

3 files changed, 5 insertions, 5 deletions

diff --git a/django/db/backends/base/operations.py b/django/db/backends/base/operations.py
index 5d3cddff9d..643c922748 100644
--- a/django/db/backends/base/operations.py
+++ b/django/db/backends/base/operations.py
@@ -262,7 +262,7 @@ class BaseDatabaseOperations(object):
 
     def prepare_sql_script(self, sql):
         """
-        Takes a SQL script that may contain multiple lines and returns a list
+        Takes an SQL script that may contain multiple lines and returns a list
         of statements to feed to successive cursor.execute() calls.
 
         Since few databases are able to process raw SQL scripts in a single
@@ -374,7 +374,7 @@ class BaseDatabaseOperations(object):
         to tables with foreign keys pointing the tables being truncated.
         PostgreSQL requires a cascade even if these tables are empty.
         """
-        raise NotImplementedError('subclasses of BaseDatabaseOperations must provide a sql_flush() method')
+        raise NotImplementedError('subclasses of BaseDatabaseOperations must provide an sql_flush() method')
 
     def sequence_reset_by_name_sql(self, style, sequences):
         """
diff --git a/django/db/models/expressions.py b/django/db/models/expressions.py
index b5586686a2..f2663752e0 100644
--- a/django/db/models/expressions.py
+++ b/django/db/models/expressions.py
@@ -477,7 +477,7 @@ class F(Combinable):
 
 class Func(Expression):
     """
-    A SQL function call.
+    An SQL function call.
     """
     function = None
     template = '%(function)s(%(expressions)s)'
diff --git a/django/db/models/fields/related_descriptors.py b/django/db/models/fields/related_descriptors.py
index abfa7283ae..5bfac8fc69 100644
--- a/django/db/models/fields/related_descriptors.py
+++ b/django/db/models/fields/related_descriptors.py
@@ -243,7 +243,7 @@ class ForwardManyToOneDescriptor(object):
             for lh_field, rh_field in self.field.related_fields:
                 setattr(instance, lh_field.attname, getattr(value, rh_field.attname))
 
-        # Set the related instance cache used by __get__ to avoid a SQL query
+        # Set the related instance cache used by __get__ to avoid an SQL query
         # when accessing the attribute we just set.
         setattr(instance, self.cache_name, value)
 
@@ -416,7 +416,7 @@ class ReverseOneToOneDescriptor(object):
             for index, field in enumerate(self.related.field.local_related_fields):
                 setattr(value, field.attname, related_pk[index])
 
-            # Set the related instance cache used by __get__ to avoid a SQL query
+            # Set the related instance cache used by __get__ to avoid an SQL query
             # when accessing the attribute we just set.
             setattr(instance, self.cache_name, value)