CONTRIBUTING.md: clarify the commands to use

Change-Id: Ie4d5220ea489ea92ba2cfdd44251aa9d4a46301e
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/45550
Reviewed-by: Tyler Bui-Palsulich <tbp@google.com>
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 85ed4df..19f4ac1 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -55,14 +55,14 @@
 and following the directions. Otherwise, `git codereview mail` in the next step
 will fail.
 
-1. Make changes then use `git codereview` to create a commit and create a Gerrit
-CL:
+1. Now you are ready to make changes. Don't create a new branch or make commits in the traditional
+way. Use the following`git codereview` commands to create a commit and create a Gerrit CL:
 
     ```
-    git codereview change <name>
+    git codereview change <branch-name> # Use this instead of git checkout -b <branch-name>
     # Make changes.
     git add ...
-    git codereview change
+    git codereview change # Use this instead of git commit
     git codereview mail # If this fails, the error message will contain instructions to fix it.
     ```
 
@@ -75,7 +75,7 @@
     ```
     # Make more changes.
     git add ...
-    git codereview change <name>
+    git codereview change
     git codereview mail
     ```