Refs #25659 -- Added missing docs for Difference/Intersection/SymDifference functions.

Complements 7127eb28.

docs/ref/contrib/gis/functions.txt

@@ -186,12 +186,16 @@ Difference
 
 .. class:: Difference(expr1, expr2, **extra)
 
-*Availability*: PostGIS, Oracle, SpatiaLite
+*Availability*: MySQL (≥ 5.6.1), PostGIS, Oracle, SpatiaLite
 
 Accepts two geographic fields or expressions and returns the geometric
 difference, that is the part of geometry A that does not intersect with
 geometry B.
 
+.. versionchanged:: 1.10
+
+    MySQL support was added.
+
 Distance
 --------
 
@@ -274,11 +278,15 @@ Intersection
 
 .. class:: Intersection(expr1, expr2, **extra)
 
-*Availability*: PostGIS, Oracle, SpatiaLite
+*Availability*: MySQL (≥ 5.6.1), PostGIS, Oracle, SpatiaLite
 
 Accepts two geographic fields or expressions and returns the geometric
 intersection between them.
 
+.. versionchanged:: 1.10
+
+    MySQL support was added.
+
 Length
 ------
 
@@ -395,12 +403,16 @@ SymDifference
 
 .. class:: SymDifference(expr1, expr2, **extra)
 
-*Availability*: PostGIS, Oracle, SpatiaLite
+*Availability*: MySQL (≥ 5.6.1), PostGIS, Oracle, SpatiaLite
 
 Accepts two geographic fields or expressions and returns the geometric
 symmetric difference (union without the intersection) between the given
 parameters.
 
+.. versionchanged:: 1.10
+
+    MySQL support was added.
+
 Transform
 ---------
 

docs/releases/1.10.txt

@@ -82,6 +82,12 @@ Minor features
 * Added support for the :class:`~django.contrib.gis.db.models.MakeLine`
   aggregate on SpatiaLite.
 
+* Added support for the
+  :class:`~django.contrib.gis.db.models.functions.Difference`,
+  :class:`~django.contrib.gis.db.models.functions.Intersection`, and
+  :class:`~django.contrib.gis.db.models.functions.SymDifference`
+  functions on MySQL.
+
 :mod:`django.contrib.messages`
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^