docs: update config params doc

docs/pages/generate-og-image/config-params.mdx

@@ -1,49 +1,49 @@
 # Configurable parameters
 
-### Location
+## Location
 
 Where do you want to deploy the functions created for this extension? For help selecting a location, refer to the [location selection guide](https://firebase.google.com/docs/functions/locations).
 
-### Template
+## Template
 
 The [handlebars](https://handlebarsjs.com/) template to use for generating the image. The template must be either a raw HTML string or a URL to a public HTML file.
 
 If you want to store the templates in a Cloud Firestore collection, leave this field empty and set the `TEMPLATES_COLLECTION` parameter instead.
 
-### Templates collection
+## Templates collection
 
 The path to the Cloud Firestore collection that contains the templates to use for generating the images. The collection must have a document for each template, where the document ID is the template name and the document contains a `template` field with the template string.
 
 If you want to use a static template, leave this field empty and set the `TEMPLATE` parameter instead.
 
-### Markdown params
+## Markdown params
 
 A comma-separated list of query parameters that contain Markdown-formatted text. The extension will convert the Markdown to HTML before rendering the template.
 
 Leave this field empty if you don't want to use Markdown.
 
-### Emoji provider
+## Emoji provider
 
 The style of emojis to use in the generated images.
 
 - `twemoji` uses [Twemoji](https://twemoji.twitter.com/) emojis.
 
-### Width
+## Width
 
 The width of the generated image in pixels.
 
-### Height
+## Height
 
 The height of the generated image in pixels.
 
-### Format
+## Format
 
 The format of the generated image.
 
-### Cache-Control header
+## Cache-Control header
 
 The value of the `Cache-Control` header to set on the generated images.
 
-### Cloud Function memory
+## Cloud Function memory
 
 The amount of memory to allocate to the Cloud Function.