Remove aliasing of glRenderbufferStorageMultisampleEXT with glRenderbufferStorageMultisample

glRenderbufferStorageMultisampleEXT is less restrictive
on multi-sample preservation and may resolve in comparison
to glRenderbufferStorageMultisample.

Hence the functionality of the latter can't be expressed
through the first.

Remove the aliasing from the gl.xml, and explicitly point
this out in the extension spec.
diff --git a/extensions/EXT/EXT_multisampled_render_to_texture.txt b/extensions/EXT/EXT_multisampled_render_to_texture.txt
index 26cb97b..ae3906a 100644
--- a/extensions/EXT/EXT_multisampled_render_to_texture.txt
+++ b/extensions/EXT/EXT_multisampled_render_to_texture.txt
@@ -21,8 +21,8 @@
 
 Version
 
-    Last Modified Date: June 28, 2016
-    Revision: 7
+    Last Modified Date: March 15, 2019
+    Revision: 8
 
 Number
 
@@ -280,6 +280,11 @@
            "The maximum number of samples supported can be determined by calling
            GetInternalformativ with a pname of SAMPLES."
 
+       RenderbufferStorageMultisampleEXT is not an alias of the OpenGL ES 3.0
+       core function RenderbufferStorageMultisample as only the former (described
+       by this extension) allows resolving multisample information in an implicit
+       way.
+
 Errors
 
     The error OUT_OF_MEMORY is generated when 
@@ -530,6 +535,9 @@
 
 Revision History
 
+    Revision 9, 2019/03/15
+     - Clarified relation to OpenGL ES 3.0 RenderbufferStorageMultisample.
+
     Revision 8, 2018/04/11
      - Clarified wording around implicit resolves, and added Issue 7.
 
diff --git a/xml/gl.xml b/xml/gl.xml
index 9a666d9..8f68681 100644
--- a/xml/gl.xml
+++ b/xml/gl.xml
@@ -25485,7 +25485,6 @@
             <param group="InternalFormat"><ptype>GLenum</ptype> <name>internalformat</name></param>
             <param><ptype>GLsizei</ptype> <name>width</name></param>
             <param><ptype>GLsizei</ptype> <name>height</name></param>
-            <glx type="render" opcode="4331"/>
         </command>
         <command>
             <proto>void <name>glRenderbufferStorageMultisampleANGLE</name></proto>
@@ -25528,7 +25527,6 @@
             <param group="InternalFormat"><ptype>GLenum</ptype> <name>internalformat</name></param>
             <param><ptype>GLsizei</ptype> <name>width</name></param>
             <param><ptype>GLsizei</ptype> <name>height</name></param>
-            <alias name="glRenderbufferStorageMultisample"/>
             <glx type="render" opcode="4331"/>
         </command>
         <command>