gallium: remove PIPE_CAP_DEPTHSTENCIL_CLEAR_SEPARATE

Reviewed-by: Brian Paul <brianp@vmware.com>
diff --git a/src/gallium/docs/source/context.rst b/src/gallium/docs/source/context.rst
index ad678ad..3ddf1ea 100644
--- a/src/gallium/docs/source/context.rst
+++ b/src/gallium/docs/source/context.rst
@@ -207,8 +207,7 @@
 Currently, this does not take into account color or stencil write masks (as
 used by GL), and always clears the whole surfaces (no scissoring as used by
 GL clear or explicit rectangles like d3d9 uses). It can, however, also clear
-only depth or stencil in a combined depth/stencil surface, if the driver
-supports PIPE_CAP_DEPTHSTENCIL_CLEAR_SEPARATE.
+only depth or stencil in a combined depth/stencil surface.
 If a surface includes several layers then all layers will be cleared.
 
 ``clear_render_target`` clears a single color rendertarget with the specified