code gardening in transliterate.rb

Saw this while doing a review of a patch:

* Normalize case and punctuation across comments.
* ascii -> ASCII
* Since I was on it, some blank lines that visually
  add some clarity IMO.

activesupport/lib/active_support/inflector/transliterate.rb

@@ -69,10 +69,12 @@ def transliterate(string, replacement = "?".freeze)
     #   parameterize("Donald E. Knuth") # => "donald-e-knuth"
     #   parameterize("^trés|Jolie-- ")  # => "tres-jolie"
     def parameterize(string, sep = '-')
-      # replace accented chars with their ascii equivalents
+      # Replace accented chars with their ASCII equivalents.
       parameterized_string = transliterate(string)
-      # Turn unwanted chars into the separator
+
+      # Turn unwanted chars into the separator.
       parameterized_string.gsub!(/[^a-z0-9\-_]+/i, sep)
+
       unless sep.nil? || sep.empty?
         if sep == "-".freeze
           re_duplicate_separator        = /-{2,}/
@@ -87,6 +89,7 @@ def parameterize(string, sep = '-')
         # Remove leading/trailing separator.
         parameterized_string.gsub!(re_leading_trailing_separator, ''.freeze)
       end
+
       parameterized_string.downcase!
       parameterized_string
     end