lint: fix quoting style everywhere

BUG=chromium:990019
TEST=`cros lint` is clean & CQ passes

Change-Id: I012966d34a45a01b3a940414b24316aee4ffe8af
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/1731476
Reviewed-by: Chris McDonald <cjmcdonald@chromium.org>
Reviewed-by: Will Bradley <wbbradley@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
diff --git a/scripts/cros_setup_toolchains.py b/scripts/cros_setup_toolchains.py
index 50f2148..cf160dc 100644
--- a/scripts/cros_setup_toolchains.py
+++ b/scripts/cros_setup_toolchains.py
@@ -1280,7 +1280,7 @@
                       help='Unmerge deprecated packages')
   parser.add_argument('-t', '--targets',
                       dest='targets', default='sdk',
-                      help="Comma separated list of tuples. Special keywords "
+                      help='Comma separated list of tuples. Special keywords '
                            "'host', 'sdk', 'boards', and 'all' are "
                            "allowed. Defaults to 'sdk'.")
   parser.add_argument('--include-boards', default='', metavar='BOARDS',