Documentation typing error

[dzucchetti]

At "5.2.1.3.1 Usage " there is probably a type errror. "fifth_column: is($a_column) or is(concat($another_column,$third_column,"/",noExt(fourth_column),".pdf")" $fourth_column should be preceded by the $

[DavidUnderdown]

Well spotted. I'll fix it in a moment