tweak docstrings

This fixes section names:
  Arguments -> Args
  Return -> Returns

It also fixes the last line of the docstring so it isn't cuddled.

And we fix a few docstrings that should be one line but aren't.

BUG=None
TEST=`./buildbot/run_tests` passes

Change-Id: Iaafb7d346a3aee97a40dab340463894c02533091
Reviewed-on: https://chromium-review.googlesource.com/176279
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
diff --git a/scripts/cros_generate_sysroot.py b/scripts/cros_generate_sysroot.py
index 556de9d..a6233ae 100644
--- a/scripts/cros_generate_sysroot.py
+++ b/scripts/cros_generate_sysroot.py
@@ -51,7 +51,7 @@
   def __init__(self, sysroot, options):
     """Initialize
 
-    Arguments:
+    Args:
       sysroot: Path to sysroot.
       options: Parsed options.
     """