Minor doc update for #9333. Took out the phrasing about os.symlink not existing and mentioned the OSError possibility.
Minor doc update for #9333. Took out the phrasing about os.symlink not
existing and mentioned the OSError possibility.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator