applies new string literal convention in guides

The current code base is not uniform. After some discussion,
we have chosen to go with double quotes by default.

1 files changed, 11 insertions, 11 deletions

diff --git a/guides/rails_guides/markdown/renderer.rb b/guides/rails_guides/markdown/renderer.rb
index 73ca600361..ec858460e8 100644
--- a/guides/rails_guides/markdown/renderer.rb
+++ b/guides/rails_guides/markdown/renderer.rb
@@ -25,7 +25,7 @@ HTML
       def paragraph(text)
         if text =~ /^(TIP|IMPORTANT|CAUTION|WARNING|NOTE|INFO|TODO)[.:]/
           convert_notes(text)
-        elsif text.include?('DO NOT READ THIS FILE ON GITHUB')
+        elsif text.include?("DO NOT READ THIS FILE ON GITHUB")
         elsif text =~ /^\[<sup>(\d+)\]:<\/sup> (.+)$/
           linkback = %(<a href="#footnote-#{$1}-ref"><sup>#{$1}</sup></a>)
           %(<p class="footnote" id="footnote-#{$1}">#{linkback} #{$2}</p>)
@@ -46,14 +46,14 @@ HTML
 
         def brush_for(code_type)
           case code_type
-            when 'ruby', 'sql', 'plain'
+            when "ruby", "sql", "plain"
               code_type
-            when 'erb', 'html+erb'
-              'ruby; html-script: true'
-            when 'html'
-              'xml' # HTML is understood, but there are .xml rules in the CSS
+            when "erb", "html+erb"
+              "ruby; html-script: true"
+            when "html"
+              "xml" # HTML is understood, but there are .xml rules in the CSS
             else
-              'plain'
+              "plain"
           end
         end
 
@@ -68,10 +68,10 @@ HTML
           # asterisk.
           body.gsub(/^(TIP|IMPORTANT|CAUTION|WARNING|NOTE|INFO|TODO)[.:](.*?)(\n(?=\n)|\Z)/m) do
             css_class = case $1
-                        when 'CAUTION', 'IMPORTANT'
-                          'warning'
-                        when 'TIP'
-                          'info'
+                        when "CAUTION", "IMPORTANT"
+                          "warning"
+                        when "TIP"
+                          "info"
                         else
                           $1.downcase
                         end