gn: Mention complete_static_lib in `gn help static_library`.

BUG=none

Review-Url: https://codereview.chromium.org/1975393003
Cr-Original-Commit-Position: refs/heads/master@{#393681}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 4f380b7cbb12e5ce75960857e9f8490f86cbdf9d
1 file changed
tree: ae1d393a0d2c84a9e46b0246208042a675703999
  1. tools/