docs: add instructions for renaming codespace display name after creation

Author: avinab-neogy

docs/assets/rdev3_5.png

@@ -20,3 +20,28 @@ GitHub Codespaces' button and then click the green 'Create Codespace' button.
 
 3. You will be taken to a VS Code editor within your browser.
 ![codespace](../../assets/rdev3.png)
+
+4. Rename your codespace for easier identification:
+
+    By default, your codespace will have a randomly generated name. Renaming it to
+    something descriptive — such as referencing the issue or feature you’re working
+    on makes it much easier to find and manage your codespaces:
+
+    **To Rename your codespace:**
+
+    - Open your [GitHub Codespaces dashboard](https://github.com/codespaces) in
+    your browser.
+    - Find the codespace you just created (it will show the repository name and
+    the current random display name).
+    - Click the ellipsis (**...**) next to your codespace to open the options menu.
+    - Select **Rename** from the dropdown.
+    - Enter a descriptive new display name, e.g.,
+    `Bug 7084 - text() recycling problems` or
+    `Ignore deprecated/defunct fns in checkS3methods`, and confirm.
+
+    ![rename codespace](../../assets/rdev3_5.png)
+
+    !!! Tip
+
+        You can rename your codespace at any time. The display name is
+        for your convenience and **does not** affect your code or environment.