📝 docs: fix spelling mistake (#252)

Co-authored-by: alamin655 <mdalamin655@outlook.com>

docs/instances.md

@@ -1,6 +1,6 @@
 # Instances 
 
-> To contribute your server instance checkout the contributing guide [here](https://github.com/neon-mmd/websurfx/blob/HEAD/CONTRIBUTING.md).
+> To contribute your server instance, check out the contributing guide [here](https://github.com/neon-mmd/websurfx/blob/HEAD/CONTRIBUTING.md).
 
 This page provides a list of `Websurfx` instances provided by us and our community.