Fix typo: adaptors => adapters [ci skip]

activerecord/lib/active_record/connection_adapters/abstract/quoting.rb

@@ -99,7 +99,7 @@ def quote_table_name(table_name)
       # This works for mysql and mysql2 where table.column can be used to
       # resolve ambiguity.
       #
-      # We override this in the sqlite and postgresql adaptors to use only
+      # We override this in the sqlite and postgresql adapters to use only
       # the column name (as per syntax requirements).
       def quote_table_name_for_assignment(table, attr)
         quote_table_name("#{table}.#{attr}")