[ruby/prism] Fix spacing in documentation comment

https://github.com/ruby/prism/commit/8408961e76

Co-authored-by: Kevin Newton <kddnewton@gmail.com>

prism/config.yml

@@ -2384,6 +2384,7 @@ nodes:
           The left-hand side of the range, if present. Can be either `nil` or
           a node representing any kind of expression that returns a non-void
           value.
+
               1...
               ^