Typos in uses of \cs and similar


git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@5308 de43f980-851b-0410-b2f7-c40aca1f87e0
Replace one instance of q__@@ by q_@@

This shows up because currently l3doc only replaces _@@ and @@
by __<module>, while l3docstrip replaces __@@, _@@, @@ in this
order.


git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@5309 de43f980-851b-0410-b2f7-c40aca1f87e0