Fix (yet another) instance of incorrect markup for a GUC variable.

doc/src/sgml/runtime.sgml

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-$PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.227 2003/12/13 23:59:06 neilc Exp $
+$PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.228 2004/01/05 20:37:51 neilc Exp $
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 <Chapter Id="runtime">
@@ -2974,7 +2974,7 @@ $ <userinput>postmaster -o '-S 1024 -s'</userinput>
     number</quote>, to detect collision with semaphore sets used by
     other applications. The maximum number of semaphores in the system
     is set by <varname>SEMMNS</>, which consequently must be at least
-    as high as <literal>max_connections</> plus one extra for each 16
+    as high as <varname>max_connections</> plus one extra for each 16
     allowed connections (see the formula in <xref
     linkend="sysvipc-parameters">).  The parameter <varname>SEMMNI</>
     determines the limit on the number of semaphore sets that can