docs, restructure newly added part to includes. [ci skip]

This is a follow up to #14139.

/cc @carlosantoniodasilva

activerecord/lib/active_record/associations.rb

@@ -774,16 +774,15 @@ def association_instance_set(name, association)
     # In the above example posts with no approved comments are not returned at all, because
     # the conditions apply to the SQL statement as a whole and not just to the association.
     #
+    # You must disambiguate column references for this fallback to happen, for example
+    # <tt>order: "author.name DESC"</tt> will work but <tt>order: "name DESC"</tt> will not.
+    #
     # If you want to load all posts (including posts with no approved comments) then write
     # your own LEFT OUTER JOIN query using ON
     #
-    #   Post.joins('LEFT OUTER JOIN comments ON comments.post_id = posts.id AND comments.approved = true')
-    #
-    # You must disambiguate column references for this fallback to happen, for example
-    # <tt>order: "author.name DESC"</tt> will work but <tt>order: "name DESC"</tt> will not.
+    #   Post.joins("LEFT OUTER JOIN comments ON comments.post_id = posts.id AND comments.approved = '1'")
     #
-    # If you do want eager load only some members of an association it is usually more natural
-    # to include an association which has conditions defined on it:
+    # In this case it is usually more natural to include an association which has conditions defined on it:
     #
     #   class Post < ActiveRecord::Base
     #     has_many :approved_comments, -> { where approved: true }, class_name: 'Comment'