Be consistent about remotes

Author: piki

_planetscale/docs/README.md

@@ -41,7 +41,7 @@ Add remotes for the public and upstream repositories:
 
 ```sh
 git remote add public [email protected]:planetscale/mysql-server
-git remote add upstream https://github.com/mysql/mysql-server
+git remote add upstream git@github.com:mysql/mysql-server
 ```
 
 Create your development branches and PRs off of `8.0.23`, for now.