Update usage-reporting.mdx (#6636)

Author: PlayAnyData

packages/web/docs/src/content/gateway/usage-reporting.mdx

@@ -76,15 +76,17 @@ import { defineConfig } from '@graphql-hive/gateway'
 export const gatewayConfig = defineConfig({
   reporting: {
     type: 'hive',
-    // The registry token provided by Hive Registry
+    // The registry token provided by Hive Registry, defaulting to process.env.HIVE_USAGE_ACCESS_TOKEN
     token: '<token>'
-    // The registry target which the usage data should be reported to
+    // The registry target which the usage data should be reported to defaulting to process.env.HIVE_USAGE_TARGET
+    // This can either be a slug following the format `$organizationSlug/$projectSlug/$targetSlug` (e.g `the-guild/graphql-hive/staging`)
+    // or an UUID (e.g. `a0f4c605-6541-4350-8cfe-b31f21a4bf80`).
     target: '<target>'
     /**
      * Other options
      *
      * selfHosting: { ... },
-     * clientInfo: { ... },
+     * clientInfo(context) { ... },
      *
      * See more in Hive Client reference
      */