add static asset bindings to list of getPlatformProxy supported bindings

Author: dario-piotrowicz

src/content/docs/workers/wrangler/api.mdx

@@ -365,6 +365,8 @@ The bindings supported by `getPlatformProxy` are:
 
 - [D1 database bindings](/d1/worker-api/)
 
+- [Static Asset bindings](/workers/static-assets/binding/#binding)
+
 - [Hyperdrive bindings](/hyperdrive)
 
   :::note[Hyperdrive values are simple passthrough ones]