Wording for updating credentials is confusing

[adam-wolfe]

Describe the bug

The meaning of "Leave blank to not store." is difficult to decipher. What does "not store" mean? What happens if I already have a user ID or password set and I clear out the textbox and press enter? Do my credentials get removed?

To Reproduce

1. Right click on a profile node.
2. Select "Manage profile".
3. Click "Update credentials".

Expected behavior

Screenshots

Desktop (please complete the following information):

• OS:
• Zowe Explorer Version:
• (Optional) Zowe CLI Version:
• (Optional) Do you have secure credentials enabled?
• (Optional) Are you using a custom credential manager?

Additional context

[github-actions]

Thank you for creating a bug report.
We will investigate the bug and evaluate its impact on the product.
If you haven't already, please ensure you have provided steps to reproduce the bug and as much context as possible.

[exequeryphil]

I can address this issue if it's still relevant.