Fix markup error in Salinger example (docs/gs.html)

This bug was reported by John Biundo <johnfbiundo@gmail.com> to
public-vocabs on 2014-05-10.

Signed-off-by: Dan Scott <dan@coffeecode.net>
Merge pull request #19 from dbs/gs_salinger_markup

Fix markup error in Salinger example (docs/gs.html)