Update sparrow-server.md

[adwatbitcoin]

fix a ink

What

fix a link

Why

Why is this change important?

How

How was this change accomplished?

Scope

• [ ] significant change to core configuration
• [ ] independent bonus guide
• [ x] simple bug fix

Fixes # (link issue)

Test & maintenance

How can the changes be tested? Is there ongoing maintenance effort? If this is a bonus guide: are you willing to update it from time to time?

Animated GIF (optional)

Add some snazz if you feel like it :)

[twofaktor]

Fixed and updated to the latest version! Thanks!