[dubbo-common] typo: config-centre

[spawpaw]

• I have searched the issues of this repository and believe that this is not a duplicate.
• I have checked the FAQ of this repository and believe that this is not a duplicate.

Environment

• Dubbo version: v2.7.3
• Java version: 1.8

Actual Result

https://github.com/apache/dubbo/blob/master/dubbo-common/src/main/java/org/apache/dubbo/common/config/ConfigurationUtils.java#L77

logger.warn("You specified the config centre, but there's not even one single config item in it.");

Expected Result

logger.warn("You specified the config center, but there's not even one single config item in it.");

Although centre has a simmilar meaning with center, we usually call a config center config center but not config centre. so consider changing it to config center?

[mercyblitz]

You can pull a request for it :D