docs: Set llvmpipe and softpipe note only for MSAA.

Right now, in mesamatrix.net, the footnote is set so that it seems to be
for all the features, while actually it only applies to MSAA.

Reviewed-by: Roland Scheidegger <sroland@vmware.com>
diff --git a/docs/GL3.txt b/docs/GL3.txt
index 4c07733..648f5ac 100644
--- a/docs/GL3.txt
+++ b/docs/GL3.txt
@@ -18,7 +18,7 @@
 Feature                                               Status
 ----------------------------------------------------- ------------------------
 
-GL 3.0, GLSL 1.30 --- all DONE: i965, nv50, nvc0, r600, radeonsi, llvmpipe (*), softpipe (*)
+GL 3.0, GLSL 1.30 --- all DONE: i965, nv50, nvc0, r600, radeonsi, llvmpipe, softpipe
 
   glBindFragDataLocation, glGetFragDataLocation         DONE
   Conditional rendering (GL_NV_conditional_render)      DONE (r300, swrast)
@@ -45,7 +45,7 @@
   glVertexAttribI commands                              DONE
   Depth format cube textures                            DONE ()
   GLX_ARB_create_context (GLX 1.4 is required)          DONE
-  Multisample anti-aliasing                             DONE (r300)
+  Multisample anti-aliasing                             DONE (llvmpipe (*), softpipe (*), r300)
 
 (*) llvmpipe and softpipe have fake Multisample anti-aliasing support