Fixed #20852 - Fixed incorrectly generated left quotes in docs.

Sphinx generates left single quotes for apostrophes after
code markup, when right single quotes are required. The
easiest way to fix this is just by inserting the unicode
character for a right single quote.

Instances of the problem were found by looking for
">‘" in the generated HTML.

docs/topics/db/managers.txt

@@ -100,7 +100,7 @@ access ``self.model`` to get the model class to which they're attached.
 Modifying initial Manager QuerySets
 -----------------------------------
 
-A ``Manager``'s base ``QuerySet`` returns all objects in the system. For
+A ``Manager``’s base ``QuerySet`` returns all objects in the system. For
 example, using this model::
 
     from django.db import models
@@ -111,7 +111,7 @@ example, using this model::
 
 ...the statement ``Book.objects.all()`` will return all books in the database.
 
-You can override a ``Manager``\'s base ``QuerySet`` by overriding the
+You can override a ``Manager``’s base ``QuerySet`` by overriding the
 ``Manager.get_queryset()`` method. ``get_queryset()`` should return a
 ``QuerySet`` with the properties you require.
 
@@ -246,7 +246,7 @@ Creating ``Manager`` with ``QuerySet`` methods
 In lieu of the above approach which requires duplicating methods on both the
 ``QuerySet`` and the ``Manager``, :meth:`QuerySet.as_manager()
 <django.db.models.query.QuerySet.as_manager>` can be used to create an instance
-of ``Manager`` with a copy of a custom ``QuerySet``'s methods::
+of ``Manager`` with a copy of a custom ``QuerySet``’s methods::
 
     class Person(models.Model):
         ...

docs/topics/db/queries.txt

@@ -720,7 +720,7 @@ efficient code.
 In a newly created :class:`~django.db.models.query.QuerySet`, the cache is
 empty. The first time a :class:`~django.db.models.query.QuerySet` is evaluated
 -- and, hence, a database query happens -- Django saves the query results in
-the :class:`~django.db.models.query.QuerySet`\'s cache and returns the results
+the :class:`~django.db.models.query.QuerySet`’s cache and returns the results
 that have been explicitly requested (e.g., the next element, if the
 :class:`~django.db.models.query.QuerySet` is being iterated over). Subsequent
 evaluations of the :class:`~django.db.models.query.QuerySet` reuse the cached

docs/topics/db/tablespaces.txt

@@ -30,7 +30,7 @@ Declaring tablespaces for indexes
 ---------------------------------
 
 You can pass the :attr:`~django.db.models.Field.db_tablespace` option to a
-``Field`` constructor to specify an alternate tablespace for the ``Field``'s
+``Field`` constructor to specify an alternate tablespace for the ``Field``’s
 column index. If no index would be created for the column, the option is
 ignored.