Update docs/integrations/avante.mdx

Co-authored-by: Dan Barr <[email protected]>

Author: kantord

docs/integrations/avante.mdx

@@ -65,8 +65,8 @@ server.
 
 ### Model muxing
 
-To take advantage of CodeGate's [model muxing feature](/features/muxing), use
-**avante.nvim**'s OpenAI provider with the following configuration:
+To take advantage of CodeGate's [model muxing feature](../features/muxing.md),
+use **avante.nvim**'s OpenAI provider with the following configuration:
 
 ```lua
 openai = {