docs: Fix formatting of num_ctx in providers.mdx

packages/web/src/content/docs/providers.mdx

@@ -527,7 +527,7 @@ In this example:
 - `models` is a map of model IDs to their configurations. The model name will be displayed in the model selection list.
 
 :::tip
-If tool calls aren't working, try increasing num_ctx in Ollama. Start around 16k-32k.
+If tool calls aren't working, try increasing `num_ctx` in Ollama. Start around 16k - 32k.
 :::
 
 ---