Remove redundant steps in MCP client installation docs. (#23034)

<!--Delete sections as needed -->

## Description

Remove a couple of redundant steps in the MCP example for "Use Claude
Desktop as a client".

Bonus: remove some end-of-line whitespaces in the doc.

## Reviews

<!-- Notes for reviewers here -->
<!-- List applicable reviews (optionally @tag reviewers) -->

- [ ] Technical review
- [X] Editorial review
- [ ] Product review

Signed-off-by: Cesar Talledo <cesar.talledo@docker.com>
Co-authored-by: Arthur <arthur.flageul@docker.com>

Author: ctalledo

content/manuals/ai/mcp-catalog-and-toolkit/toolkit.md

@@ -154,13 +154,6 @@ and add Claude Desktop as a client:
    ```text
    Take a screenshot of docs.docker.com and then invert the colors
    ```
-5. From the **Clients** tab, select **Connect** next to **Claude Desktop**. Restart
-   Claude Desktop if it's running, and it can now access all the servers in the MCP Toolkit.
-6. Within Claude Desktop, run a test by submitting the following prompt using the Sonnet 3.5 model:
-
-   ```text
-   Take a screenshot of docs.docker.com and then invert the colors
-   ```
 
 ### Example: Use Visual Studio Code as a client