Add note on named specializations

docs/source/operations/projections/cea.rst

@@ -4,6 +4,11 @@
 Equal Area Cylindrical
 ********************************************************************************
 
+Equal area cylindrical has a number of named specializations, 
+such as `Gall–Peters https://en.wikipedia.org/wiki/Gall%E2%80%93Peters_projection`_ (lat_ts=45), 
+`Behrmann https://en.wikipedia.org/wiki/Behrmann_projection`_ (lat_ts=30), and 
+`Lambert cylindrical equal-area https://en.wikipedia.org/wiki/Lambert_cylindrical_equal-area_projection`_ (lat_ts=0).
+
 +---------------------+----------------------------------------------------------+
 | **Classification**  | Cylindrical                                              |
 +---------------------+----------------------------------------------------------+
@@ -51,4 +56,4 @@ Parameters
 
     ``lat_ts`` and ``k_0`` are mutually exclusive. If ``lat_ts``
     is specified, it is equivalent to setting ``k_0`` to
-    :math:`\frac{\cos \phi_{ts}}{\sqrt{1 - e^2 \sin^2 \phi_{ts}}}`
+    :math:`\frac{\cos \phi_{ts}}{\sqrt{1 - e^2 \sin^2 \phi_{ts}}}`