gn: fix documentation typo

s/currebt/current/

TBR=brettw

Review URL: https://codereview.chromium.org/1318963007

Cr-Original-Commit-Position: refs/heads/master@{#347900}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 789ee894bc267131853e100eb256697badf5709a
2 files changed
tree: bd4bac21f36556f2073245fe5ebcb8a8e64e1b74
  1. tools/