Fix link for creating release note PR (nushell#728)

@amtoine I couldn't get it to work with the old link, but with this fix,
opening the PR worked like charm!

Author: kubouch

make_release/release-note/create-pr

@@ -97,7 +97,7 @@ by opening PRs against the `release-notes-($version)` branch.
 
     log info "setting up nushell.github.io repo"
     git clone https://github.com/nushell/nushell.github.io $repo --origin nushell --branch main --single-branch
-    git -C $repo remote set-url nushell --push ssh://github.com/nushell/nushell.github.io
+    git -C $repo remote set-url nushell --push git@github.com:nushell/nushell.github.io.git
 
     log info "creating release branch"
     git -C $repo checkout -b $branch nushell/main