Prefer tr over gsub to translate single letters

Author: nobu

lib/rdoc/generator/darkfish.rb

@@ -714,13 +714,13 @@ def excerpt(comment)
     # Match from a capital letter to the first period, discarding any links, so
     # that we don't end up matching badges in the README
     first_paragraph_match = text.match(ParagraphExcerptRegexp)
-    return text[0...150].gsub(/\n/, " ").squeeze(" ") unless first_paragraph_match
+    return text[0...150].tr_s("\n", " ").squeeze(" ") unless first_paragraph_match
 
     extracted_text = first_paragraph_match[0]
     second_paragraph = first_paragraph_match.post_match.match(ParagraphExcerptRegexp)
     extracted_text << " " << second_paragraph[0] if second_paragraph
 
-    extracted_text[0...150].gsub(/\n/, " ").squeeze(" ")
+    extracted_text[0...150].tr_s("\n", " ").squeeze(" ")
   end
 
   def generate_ancestor_list(ancestors, klass)