Update the documentation for GrResourceAllocator

This class has changed with reordering so we need to
freshen these up.

Bug: skia:10877
Change-Id: Ic1bfabe7b21d665e6b50cad8be4026dc3481fb9c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/411217
Auto-Submit: Adlai Holler <adlai@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
1 file changed