scrapping an arguable joke in the macro guide

Author: xeno-by

overviews/macros/overview.md

@@ -124,7 +124,7 @@ It's customary to import `c.universe._`, because it includes a lot of routinely
 First of all, the macro needs to parse the provided format string.
 Macros run during the compile-time, so they operate on trees, not on values.
 This means that the format parameter of the `printf` macro will be a compile-time literal, not an object of type `java.lang.String`.
-This also means that the code below won't work for `printf(get_format(), ...)`, because in that case `format` won't be a string literal, but rather an AST that represents a function application. Adjusting the macro to work for arbitrary expressions is left as an exercise for the reader.
+This also means that the code below won't work for `printf(get_format(), ...)`, because in that case `format` won't be a string literal, but rather an AST that represents a function application.
 
     val Literal(Constant(s_format: String)) = format.tree