docs: Update release notes and GL3.txt for GL_ARB_texture_compression_bptc

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
diff --git a/docs/relnotes/10.3.html b/docs/relnotes/10.3.html
index a1f2777..3625483 100644
--- a/docs/relnotes/10.3.html
+++ b/docs/relnotes/10.3.html
@@ -63,6 +63,7 @@
 <li>GL_OES_compressed_ETC1_RGB8_texture on nv30, nv50, nvc0, r300, r600, radeonsi, softpipe, llvmpipe</li>
 <li>A new software rasterizer driver (kms_swrast_dri.so) that works with
 DRM drivers that don't have a full-fledged GEM (such as qxl or simpledrm)</li>
+<li>GL_ARB_texture_compression_bptc on i965/gen7+</li>
 </ul>