docs: add missing extension-link

Not sure why I missed this one during the last round, but it seems I
did. Let's add the link!

Reviewed-by: David Heidelberg <david.heidelberg@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19719>

diff --git a/docs/envvars.rst b/docs/envvars.rst
index bd31a16..db47503 100644 (file)
--- a/docs/envvars.rst
+++ b/docs/envvars.rst
@@ -801,7 +801,7 @@ RADV driver environment variables
    ``nosam``
       disable optimizations that get enabled when all VRAM is CPU visible.
    ``nv_ms``
-      enable unofficial experimental support for NV_mesh_shader.
+      enable unofficial experimental support for :ext:`VK_NV_mesh_shader`.
    ``pswave32``
       enable wave32 for pixel shaders (GFX10+)
    ``ngg_streamout``