message: improve steps for the beta promotion
diff: @@ -49,38 +49,24 @@ RUSTUP_DIST_SERVER=https://dev-static.rust-lang.org rustup update stable
  ## Promote master to beta (T-2 days, Tuesday)
  -We need to find out the parent commit in which the PR opened last Monday merged.
  -
  -Go to that PR, and find the "bors merged commit $SHA into rust-lang:master at the bottom.
  -
  -Locally, run `` export BRANCH_POINT=`git rev-parse $SHA^` `` in the rust-lang/rust
  -checkout. This should be bors-authored merge into master of the PR before the
  -version bump merged.
  -
  -Create a new branch on `rust-lang/cargo` for the new beta. Here, `rust-lang` is
  -the remote for https://github.com/rust-lang/rust.git. Replace `YY` with the
  -minor version of master. First determine the branch point for cargo in
  -`rust-lang/rust`, and then create a new branch:
  +Gather the relevant information and push the new Cargo branch:
  ```sh
  -cd rust
  -git fetch rust-lang
  +git fetch git@github.com:rust-lang/rust
  +BRANCH_POINT=`git log --merges --first-parent --format="%P" -1 master -- src/version | awk '{print($1)}'`
  NEW_BETA_VERSION=`git show $BRANCH_POINT:src/version`
  CARGO_SHA=`git rev-parse $BRANCH_POINT:src/tools/cargo`
  +
  cd src/tools/cargo
  git branch rust-$NEW_BETA_VERSION $CARGO_SHA
  -git push origin rust-$NEW_BETA_VERSION
  +git push git@github.com:rust-lang/cargo rust-$NEW_BETA_VERSION
  ```
  -You'll need to temporarily disable branch protection on GitHub to push the new
  -branch.
  -
  Temporarily disable banch protection on GitHub for the `beta` branch of the Rust
  repo. Promote rust-lang/rust's master branch to beta as with yesterday:
  ```sh
  -$ git fetch rust-lang
  -$ git push rust-lang $BRANCH_POINT:beta -f
  +git push git@github.com:rust-lang/rust $BRANCH_POINT:beta -f
  ```
  Re-enable branch protection on GitHub. Send a PR to the freshly created beta
  