docs: finish user guide updates (#11603)

* finished settings changes

* fix todos

* update titles

www/apps/user-guide/app/settings/sales-channels/page.mdx

@@ -5,7 +5,7 @@ sidebar_position: 8
 import { EllipsisHorizontal } from "@medusajs/icons"
 
 export const metadata = {
-  title: `Manage Sales Channels`,
+  title: `Manage Sales Channels in Medusa Admin`,
 }
 
 # {metadata.title}
@@ -28,9 +28,7 @@ Sales channels are associated with other data and settings in your commerce stor
 
 <Note title="Technical Tip">
 
-{/* TODO add link */}
-
-Developers can use [Publishable API Keys](#) to easily associate a storefront or client with a sales channel.
+Developers can use [Publishable API Keys](../developer/secret-api-keys/page.mdx) to easily associate a storefront or client with a sales channel.
 
 </Note>