Fix typo in push_to_gs.sh which causes incorrect upload.

R=vadimsh@chromium.org
BUG=

Review URL: https://codereview.chromium.org/267393015

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@269082 0039d316-1c4b-4281-b951-d872f2087c98

man/push_to_gs.sh

 #!/bin/bash
 
 MY_DIR=$(dirname "$(readlink "$0")")
-gsutil cp -r -z html -a public-read  "$MY_DIR/html" gs://chrome-infra-docs/flat/depot_tools/docs/html
+gsutil cp -r -z html -a public-read  "$MY_DIR/html" gs://chrome-infra-docs/flat/depot_tools/docs/