docs: add missed i965 feature to relnotes
docs: add missed i965 feature to relnotes

Trivial.  GL_ARB_fragment_layer_viewport support was added in 8c902a58
by Ken.

Signed-off-by: Ian Romanick <2b237cafb16dc45038e85df6c85e74e6d899eba9@intel.com>
Cc: "11.1" <59f39c0db42d4479a46b02d4d2bc11120e37bb44@lists.freedesktop.org>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler