docs: add instructions for renaming codespace display name after creation

Author: avinab-neogy

docs/assets/rdev3_5.png

@@ -19,3 +19,21 @@ GitHub Codespaces' button and then click the green 'Create Codespace' button.
 
 3. You will be taken to a VSCode 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, especially if you use several.
+
+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., `r-dev-env-issue-229` or `r-dev-env-patch-naming`) 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.
+