[4.2.x] Corrected pycon formatting in some docs.

Backport of 5a37255 from main

docs/ref/contrib/gis/gdal.txt

@@ -548,7 +548,7 @@ coordinate transformation:
 
     .. code-block:: pycon
 
-        >> polygon.dimension
+        >>> polygon.dimension
         2
 
     .. attribute:: coord_dim

docs/ref/models/expressions.txt

@@ -76,33 +76,33 @@ Some examples
 
     # Annotate models with an aggregated value. Both forms
     # below are equivalent.
-    Company.objects.annotate(num_products=Count('products'))
-    Company.objects.annotate(num_products=Count(F('products')))
+    >>> Company.objects.annotate(num_products=Count("products"))
+    >>> Company.objects.annotate(num_products=Count(F("products")))
 
     # Aggregates can contain complex computations also
-    Company.objects.annotate(num_offerings=Count(F('products') + F('services')))
+    >>> Company.objects.annotate(num_offerings=Count(F("products") + F("services")))
 
     # Expressions can also be used in order_by(), either directly
-    Company.objects.order_by(Length('name').asc())
-    Company.objects.order_by(Length('name').desc())
+    >>> Company.objects.order_by(Length("name").asc())
+    >>> Company.objects.order_by(Length("name").desc())
     # or using the double underscore lookup syntax.
-    from django.db.models import CharField
-    from django.db.models.functions import Length
-    CharField.register_lookup(Length)
-    Company.objects.order_by('name__length')
+    >>> from django.db.models import CharField
+    >>> from django.db.models.functions import Length
+    >>> CharField.register_lookup(Length)
+    >>> Company.objects.order_by("name__length")
 
     # Boolean expression can be used directly in filters.
-    from django.db.models import Exists
-    Company.objects.filter(
-        Exists(Employee.objects.filter(company=OuterRef('pk'), salary__gt=10))
-    )
+    >>> from django.db.models import Exists
+    >>> Company.objects.filter(
+    ...     Exists(Employee.objects.filter(company=OuterRef("pk"), salary__gt=10))
+    ... )
 
     # Lookup expressions can also be used directly in filters
-    Company.objects.filter(GreaterThan(F('num_employees'), F('num_chairs')))
+    >>> Company.objects.filter(GreaterThan(F("num_employees"), F("num_chairs")))
     # or annotations.
-    Company.objects.annotate(
-        need_chairs=GreaterThan(F('num_employees'), F('num_chairs')),
-    )
+    >>> Company.objects.annotate(
+    ...     need_chairs=GreaterThan(F("num_employees"), F("num_chairs")),
+    ... )
 
 Built-in Expressions
 ====================
@@ -257,10 +257,10 @@ primary key value rather than a model instance:
 
 .. code-block:: pycon
 
-    >> car = Company.objects.annotate(built_by=F('manufacturer'))[0]
-    >> car.manufacturer
+    >>> car = Company.objects.annotate(built_by=F("manufacturer"))[0]
+    >>> car.manufacturer
     <Manufacturer: Toyota>
-    >> car.built_by
+    >>> car.built_by
     3
 
 .. _using-f-to-sort-null-values: