book: move warning to the right place

book/src/development/infrastructure/backport.md

@@ -28,6 +28,7 @@ repository. You can do this with:
 ```bash
 # Assuming the current directory corresponds to the Rust repository
 $ git checkout beta
+# Make sure to change `your-github-name` to your github name in the following command
 $ git subtree pull -p src/tools/clippy https://github.com/<your-github-name>/rust-clippy backport
 $ ./x.py test src/tools/clippy
 ```

book/src/development/infrastructure/sync.md

@@ -79,8 +79,7 @@ to be run inside the `rust` directory):
    `rustup check`.
 3. Sync the changes to the rust-copy of Clippy to your Clippy fork:
     ```bash
-    # Make sure to change `your-github-name` to your github name in the following command. Also be
-    # sure to either use a net-new branch, e.g. `sync-from-rust`, or delete the branch beforehand
+    # Be sure to either use a net-new branch, e.g. `sync-from-rust`, or delete the branch beforehand
     # because changes cannot be fast forwarded and you have to run this command again.
     git subtree push -P src/tools/clippy clippy-local sync-from-rust
     ```