[temp.spec.general] Format grammar terms (#4849)

Author: JohelEGP

source/templates.tex

@@ -5617,7 +5617,7 @@
 The usual access checking rules do not apply to names
 in a declaration of an explicit instantiation or explicit specialization,
 with the exception of names appearing in a function body,
-default argument, base-clause, member-specification, enumerator-list,
+default argument, \grammarterm{base-clause}, \grammarterm{member-specification}, \grammarterm{enumerator-list},
 or static data member or variable template initializer.
 \begin{note}
 In particular, the template arguments and names