[temp.names] Add missing comma.

Author: zygoloid

source/templates.tex

@@ -598,7 +598,7 @@
 After name lookup~(\ref{basic.lookup}) finds that a name is a
 \grammarterm{template-name}
 or that an \grammarterm{operator-function-id} or a \grammarterm{literal-operator-id} refers to a set of
-overloaded functions any member of which is a function template
+overloaded functions any member of which is a function template,
 if this is followed by a
 \tcode{<},
 the