[expr.call] Change word order to clarify that it is only the main function

that cannot be called, not any arbitrary function whose name is main.

Fixes #261.

Author: zygoloid

source/expressions.tex

@@ -1430,8 +1430,8 @@
 
 \pnum
 \indextext{function~call!recursive}%
-Recursive calls are permitted, except to the function named
-\tcode{main}~(\ref{basic.start.main}).
+Recursive calls are permitted, except to the \tcode{main}
+function~(\ref{basic.start.main}).
 
 \pnum
 A function call is an lvalue