Update contributor doc (#4966)
Update contributor doc (#4966)

* Develop Flow => Developer Flow

* update contributor page
leeyazhou/sharding-jdbc,leeyazhou/sharding-jdbc,apache/incubator-shardingsphere,apache/incubator-shardingsphere,apache/incubator-shardingsphere,apache/incubator-shardingsphere,leeyazhou/sharding-jdbc,leeyazhou/sharding-jdbc