gve: update gve.rst Add a note about QPL and RDA mode BUG=b/291799463 cos-patch: bug Change-Id: I0173819797840c19325caa9181238343dd89eca5 Reviewed-on: https://cos-review.googlesource.com/c/third_party/kernel/+/54470 Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com> Main-Branch-Verified: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com> Reviewed-by: Oleksandr Tymoshenko <ovt@google.com>