[Pages] Add reference to pages functions on limits page

PCX-14077

Author: kodster28

src/content/docs/pages/platform/limits.mdx

@@ -46,6 +46,12 @@ To serve larger files, consider uploading them to [R2](/r2/) and utilizing the [
 
 :::
 
+## Functions
+
+Requests to your Pages functions count towards your quota for Workers plans, including requests from your Function to KV or Durable Object bindings.
+
+Pages supports the [Standard usage model](/workers/platform/pricing/#example-pricing-standard-usage-model).
+
 ## Headers
 
 A `_headers` file can have a maximum of 100 header rules.