glasgow_exts.rst: fix quoting
glasgow_exts.rst: fix quoting

glasgow_exts.rst:6525: WARNING: Inline literal start-string without end-string.

Signed-off-by: Sergei Trofimovich <df7d2cee2e7ececeb2368216a0f9d0537fd32149@google.com>

olsner/ghc,shlevy/ghc,vikraman/ghc,vikraman/ghc,snoyberg/ghc,vTurbine/ghc,vTurbine/ghc,vikraman/ghc,sgillespie/ghc,snoyberg/ghc,mettekou/ghc,mettekou/ghc,ezyang/ghc,vTurbine/ghc,sgillespie/ghc,mettekou/ghc,vTurbine/ghc,mettekou/ghc,sgillespie/ghc,sdiehl/ghc,sdiehl/ghc,ezyang/ghc,vikraman/ghc,vikraman/ghc,mettekou/ghc,sdiehl/ghc,sgillespie/ghc,olsner/ghc,sdiehl/ghc,olsner/ghc,mettekou/ghc,sdiehl/ghc,sgillespie/ghc,shlevy/ghc,olsner/ghc,ezyang/ghc,ezyang/ghc,vikraman/ghc,shlevy/ghc,vTurbine/ghc,shlevy/ghc,ezyang/ghc,sdiehl/ghc,ezyang/ghc,ezyang/ghc,sgillespie/ghc,shlevy/ghc,shlevy/ghc,vTurbine/ghc,snoyberg/ghc,sgillespie/ghc,snoyberg/ghc,shlevy/ghc,olsner/ghc,sdiehl/ghc,snoyberg/ghc,vikraman/ghc,vTurbine/ghc,mettekou/ghc,olsner/ghc,olsner/ghc,snoyberg/ghc,snoyberg/ghc