Update the remaining docs to use the new recipe highlighter (#2797)

Author: mgorny

docs/how-to/advanced/self-hosted-runners.mdx

@@ -51,7 +51,7 @@ provider:
   linux_aarch64: github_actions
 ```
 
-```yaml title="recipe/conda_build_config.yaml"
+```recipe title="recipe/conda_build_config.yaml"
 github_actions_labels:
 - a-custom-self-hosted-provider  # [linux64]
 # absent value for linux-aarch64 means it will use the default; same as:

docs/maintainer/conda_forge_yml.mdx

@@ -71,7 +71,7 @@ Each string must be one of:
 
 Example:
 
-```yaml title="recipe/conda_build_config.yaml"
+```recipe title="recipe/conda_build_config.yaml"
 github_actions_labels:
 - a-custom-self-hosted-provider  # [linux64]
 # absent value for linux-aarch64 means it will use the default; same as: