fix wrong directory in manual doc, hack.txt.

BUG=None
TEST=No source code changes, only doc change

Change-Id: I51cf401e34ef7f9f5f8b5546393cd7b4bf560b83
Reviewed-on: https://gerrit.chromium.org/gerrit/47987
Commit-Queue: Robert Ginda <rginda@chromium.org>
Reviewed-by: Robert Ginda <rginda@chromium.org>
Tested-by: Robert Ginda <rginda@chromium.org>
1 file changed
tree: 81515a1de8ecb6d3b01972a524bfe1226c377e95
  1. crosh_builtin/
  2. hterm/
  3. libdot/
  4. nassh/