📝 (docs): fix typo in Unsplash description (baptisteArno#1094)

Documentation

This PR updates the documentation to fix an incorrect description for
the Unsplash configuration.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **Documentation**
- Corrected a hyperlink and associated text in the self-hosting
configuration guide, changing "Giphy" to "Unsplash" for image search
references.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Signed-off-by: Victor Santos <vsantos.py@gmail.com>

apps/docs/docs/self-hosting/configuration.md

@@ -159,7 +159,7 @@ Used to search for GIF. You can create a Giphy app [here](https://developers.gip
 
 ## Unsplash (image picker)
 
-Used to search for images. You can create a Giphy app [here](https://unsplash.com/developers)
+Used to search for images. You can create an Unsplash app [here](https://unsplash.com/developers)
 
 | Parameter                       | Default | Description       |
 | ------------------------------- | ------- | ----------------- |