documentation repeat

[balhoff]

Should these two lines be showing a difference?

https://github.com/lihaoyi/fastparse/blob/99a7c11acb51443ca9b8f6deb1f2a5ca7bf48365/fastparse/test/src/fastparse/ExampleTests.scala#L93-L94

"Similar to .rep is .?, which creates a new parser that attempts to parse the given parser zero or 1 times."