Fixed capitalization of "Spherical Mercator."

docs/ref/contrib/gis/admin.txt

@@ -67,7 +67,7 @@ GeoDjango's admin site
 
 .. class:: OSMGeoAdmin
 
-    A subclass of :class:`GeoModelAdmin` that uses a spherical mercator projection
+    A subclass of :class:`GeoModelAdmin` that uses a Spherical Mercator projection
     with `OpenStreetMap <https://www.openstreetmap.org/>`_ street data tiles.
     See the :ref:`OSMGeoAdmin introduction <osmgeoadmin-intro>`
     in the tutorial for a usage example.

docs/spelling_wordlist

@@ -393,7 +393,6 @@ MBR
 memcache
 memcached
 mentorship
-mercator
 metaclass
 metaclasses
 metadata

tests/gis_tests/geoapp/test_functions.py

@@ -204,7 +204,7 @@ class GISFunctionsTests(TestCase):
     @skipUnlessDBFeature("has_Difference_function", "has_Transform_function")
     def test_difference_mixed_srid(self):
         """Testing with mixed SRID (Country has default 4326)."""
-        geom = Point(556597.4, 2632018.6, srid=3857)  # Spherical mercator
+        geom = Point(556597.4, 2632018.6, srid=3857)  # Spherical Mercator
         qs = Country.objects.annotate(difference=functions.Difference('mpoly', geom))
         # Oracle does something screwy with the Texas geometry.
         if oracle: