Update ANGLE docs to match MakeCurrent status
Update ANGLE docs to match MakeCurrent status

MakeCurrent no longer generates EGL_BAD_SURFACE when the pbuffers are
IOSurfaces. So the documentation has been updated to match.

Bug chromium:987289

Change-Id: Id074d9d6d8d0a50c91ec725ec2016a4f5ad4b6e4
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/34568
Presubmit-Ready: Sean Risser <2d04e98eeaa433fb55534399ab3ab2c06fdf7967@google.com>
Kokoro-Presubmit: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Reviewed-by: Nicolas Capens <51edc787c30f24c4904e8ffbb5523c3a9f7a451d@google.com>
Tested-by: Sean Risser <2d04e98eeaa433fb55534399ab3ab2c06fdf7967@google.com>

google/swiftshader,bkaradzic/SwiftShader,bkaradzic/SwiftShader,bkaradzic/SwiftShader,bkaradzic/SwiftShader,google/swiftshader,bkaradzic/SwiftShader,google/swiftshader