Fixed some spelling errors in documentation about...

Fixed some spelling errors in documentation about AssociationCollection::destroy and AssociationCollection::destroy_all.

This time without the whitespace fixes and move of the destroy_all method.

activerecord/lib/active_record/associations/association_collection.rb

@@ -143,6 +143,8 @@ def transaction(*args)
       end
 
       # Remove all records from this association
+      #
+      # See delete for more info.
       def delete_all
         load_target
         delete(@target)
@@ -200,11 +202,11 @@ def delete(*records)
         end
       end
 
-      # Destroy +records+ and remove from this association calling +before_remove+
-      # and +after_remove+ callbacks.
+      # Destroy +records+ and remove them from this association calling
+      # +before_remove+ and +after_remove+ callbacks.
       #
-      # Note this method will always remove records from database ignoring the
-      # +:dependent+ option.
+      # Note that this method will _always_ remove records from the database
+      # ignoring the +:dependent+ option.
       def destroy(*records)
         remove_records(records) do |records, old_records|
           old_records.each { |record| record.destroy }
@@ -226,7 +228,9 @@ def clear
         self
       end
 
-      # Destory all the records from this association
+      # Destory all the records from this association.
+      #
+      # See destroy for more info.
       def destroy_all
         load_target
         destroy(@target)