[Mac/iOS/GN] Document enable_stripping and enable_dsyms vs their GYP equivalents.

BUG=330301
R=brettw@chromium.org

Review-Url: https://codereview.chromium.org/2084153002
Cr-Original-Commit-Position: refs/heads/master@{#401320}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: d6fd033cbaddd2f127b244c48a3cfd8f7a3e953d
1 file changed
tree: d970f0ec50ff88808fcc261ce8bf426dd6b42786
  1. tools/