(DOCSP-10776): Link to Swift driver docs from iOS SDK (#1062)

Author: dacharyc

source/sdk/ios.txt

@@ -32,6 +32,12 @@ The {+service+} Swift SDK enables mobile applications to access data
 stored in local {+realms+}. Optionally, interact with {+backend+} services 
 like Functions, MongoDB Data Access, and authentication.
 
+.. seealso::
+
+   Are you looking for information about using Swift with MongoDB in a 
+   backend app, command-line utility, or running on macOS or Linux? See 
+   the :driver:`MongoDB Swift Driver documentation </swift>`.
+
 Realm Database
 --------------