Use backticks around fixed width message in warning not magic quotes

Author: zzak

activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb

@@ -766,7 +766,7 @@ def handle_warnings(sql)
           warning_count = @raw_connection.warning_count
           result = @raw_connection.query("SHOW WARNINGS")
           result = [
-            ["Warning", nil, "Query had warning_count=#{warning_count} but ‘SHOW WARNINGS’ did not return the warnings. Check MySQL logs or database configuration."],
+            ["Warning", nil, "Query had warning_count=#{warning_count} but `SHOW WARNINGS` did not return the warnings. Check MySQL logs or database configuration."],
           ] if result.count == 0
           result.each do |level, code, message|
             warning = SQLWarning.new(message, code, level, sql, @pool)

activerecord/test/cases/adapters/abstract_mysql_adapter/warnings_test.rb

@@ -101,7 +101,7 @@ def setup
           @connection.execute('SELECT "x"')
         end
 
-        expected = "Query had warning_count=1 but ‘SHOW WARNINGS’ did not return the warnings. Check MySQL logs or database configuration."
+        expected = "Query had warning_count=1 but `SHOW WARNINGS` did not return the warnings. Check MySQL logs or database configuration."
         assert_equal expected, error.message
       end
     end