Make Style/AutoResourceCleanup examples equivalent

In the bad example, `f` is the `File` object, so in the good example it should be the same. (Prior to this commit, `f` in the good example is the return value of the block passed to `File.open`.)
rubocop · Sep 11, 2017 · 04087f9 · 04087f9
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diff --git a/lib/rubocop/cop/style/auto_resource_cleanup.rb b/lib/rubocop/cop/style/auto_resource_cleanup.rb
@@ -13,7 +13,7 @@ module Style
       #   f = File.open('file')
       #
       #   # good
-      #   f = File.open('file') do
+      #   File.open('file') do |f|
       #     ...
       #   end
       class AutoResourceCleanup < Cop

diff --git a/manual/cops_style.md b/manual/cops_style.md
@@ -147,7 +147,7 @@ resource cleanup.
 f = File.open('file')
 
 # good
-f = File.open('file') do
+File.open('file') do |f|
   ...
 end
 ```
-Original file line number
+Diff line change
@@ Expand Up / @@ -147,7 +147,7 @@ resource cleanup. @@
     f = File.open('file')
     # good
-    f = File.open('file') do
+    File.open('file') do |f|
       ...
     end
     ```
@@ Expand Down @@