README: minor edit to intro paragraph (#9944)
README: minor edit to intro paragraph (#9944)


c4pt0r/tidb,kyle-wang/tidb,XuHuaiyu/tidb,ngaut/tidb,cosmtrek/tidb,c4pt0r/tidb,c4pt0r/tidb,qiuyesuifeng/tidb,XuHuaiyu/tidb,coocood/tidb,pingcap/tidb,kyle-wang/tidb,pingcap/tidb,ngaut/tidb,kyle-wang/tidb,pingcap/tidb,kyle-wang/tidb,EvilMcJerkface/tidb,ngaut/tidb,EvilMcJerkface/tidb,qiuyesuifeng/tidb,pingcap/tidb,pingcap/tidb,ngaut/tidb,coocood/tidb,ngaut/tidb,ngaut/tidb,c4pt0r/tidb,ming-relax/tidb,c4pt0r/tidb,ming-relax/tidb,c4pt0r/tidb,Cofyc/tidb,cosmtrek/tidb,kyle-wang/tidb,pingcap/tidb,Cofyc/tidb,kyle-wang/tidb