[over.call.func] Make colon in bnf non-italic.

Eelis · Eelis · commit 39d85e6ef6fc · 2020-11-23T00:49:33.000+01:00
diff --git a/source/overloading.tex b/source/overloading.tex
@@ -745,7 +745,7 @@
 parentheses, has one of the following forms:
 
 \begin{ncbnf}
-postfix-expression:\br
+postfix-expression\textnormal{:}\br
     postfix-expression \terminal{.} id-expression\br
     postfix-expression \terminal{->} id-expression\br
     primary-expression
