README: update contributing guide (pingcap#20262)

dcalvin · web-flow · commit 21549e46c661 · 2020-09-29T19:00:27.000+08:00
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -1,4 +1,3 @@
-# Contribution Guide
+# Contributing Guide
 
-See the [Contribution Guide](https://github.com/pingcap/community/blob/master/CONTRIBUTING.md) in the
-[community](https://github.com/pingcap/community) repo.
+See the [Contributing Guide](https://github.com/pingcap/community/blob/master/contributors/README.md) in the [community](https://github.com/pingcap/community) repository.
