[R2] Update object-lifecycles.mdx (#24520)

* [R2] Update object-lifecycles.mdx

Per dashboard.

* Update src/content/docs/r2/buckets/object-lifecycles.mdx

---------

Co-authored-by: Jun Lee <[email protected]>

Author: nenizera

src/content/docs/r2/buckets/object-lifecycles.mdx

@@ -30,9 +30,9 @@ When you create an object lifecycle rule, you can specify which prefix you would
 1. From the Cloudflare dashboard, select **R2**.
 2. Locate and select your bucket from the list.
 3. From the bucket page, select **Settings**.
-4. Under **Object lifecycle rules**, select **Add rule**.
+4. Under **Object Lifecycle Rules**, select **Add rule**.
 5. Fill out the fields for the new rule.
-6. When you are done, select **Add rule**.
+6. When you are done, select **Save changes**.
 
 ### Wrangler