Merge pull request #591 from spastorino/macro_repeat

Explain better the macro repeat expressions

Author: steveklabnik

examples/macros/repeat/input.md

@@ -2,4 +2,8 @@ Macros can use `+` in the argument list to indicate that an argument may
 repeat at least once, or `*`, to indicate that the argument may repeat zero or
 more times.
 
+In the following example, surrounding the matcher with `$(...),+` will
+match one or more expression, separated by commas.
+Also note that the semicolon is optional on the last case.
+
 {repeat.play}