fix indenting to get markdown to recognise the code block properly

docs/storage/index.markdown

@@ -85,29 +85,29 @@ Now you've got a bunch of files in S3: your resume, some code samples,
 and maybe some pictures of your cat doing funny stuff. Since this is
 all of vital importance, you need to back it up.
 
-   # copy each file to local disk
-   directory.files.each do |s3_file|
-     File.open(s3_file.key, 'w') do |local_file|
-       local_file.write(s3_file.body)
-     end
-   end
+    # copy each file to local disk
+    directory.files.each do |s3_file|
+      File.open(s3_file.key, 'w') do |local_file|
+        local_file.write(s3_file.body)
+      end
+    end
 
 One caveat: it's way more efficient to do this:
 
-  # do two things per file
-  directory.files.each do |file|
-    do_one_thing(file)
-    do_another_thing(file)
-  end
+    # do two things per file
+    directory.files.each do |file|
+      do_one_thing(file)
+      do_another_thing(file)
+    end
 
 than it is to do this:
 
-  # do two things per file
-  directory.files.each do |file|
-    do_one_thing(file)
-  end.each do |file|
-    do_another_thing(file)
-  end
+    # do two things per file
+    directory.files.each do |file|
+      do_one_thing(file)
+    end.each do |file|
+      do_another_thing(file)
+    end
 
 The reason is that the list of files might be large. Really
 large. Eat-all-your-RAM-and-ask-for-more large. Therefore, every time