Add KDoc to the authentication, logout, preferences and share API interfaces

Cover the remaining interfaces of features/login, features/logout,
features/preferences and features/share, along with their members and parameters.

Points recorded here: AccountProviderAccessControl returns true on a build with no
enterprise restriction, ExtraDeveloperOptionsRenderer is bound to a no-op in the
standard build, DirectLogoutView draws nothing until a logout event is sent, and
CacheService exists because clearing a cache destroys the client and the app has
to react.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

features/share/api/src/main/kotlin/io/element/android/features/share/api/OnSharedData.kt

@@ -11,5 +11,8 @@ package io.element.android.features.share.api
  * Post-processing to be done once a [ShareIntentData] has been consumed.
  */
 fun interface OnSharedData {
+    /**
+     * @param data the shared content that has just been handled, so any temporary copy of it can be released.
+     */
     operator fun invoke(data: ShareIntentData)
 }

features/share/api/src/main/kotlin/io/element/android/features/share/api/ShareIntentHandler.kt

@@ -9,10 +9,14 @@ package io.element.android.features.share.api
 
 import android.content.Intent
 
+/**
+ * Recognises the intents another app uses to share content into this one, and resolves what was shared.
+ */
 interface ShareIntentHandler {
     /**
      * This methods aims to handle incoming share intents and parse its data.
      *
+     * @param intent the intent the app was started with.
      * @return the [ShareIntentData] if it could be resolved, or null.
      */
     fun handleIncomingShareIntent(