Clarify semantics in call composer extras

Docs updates:
* setCallExtraParcelable must take a framework-defined parcelable
* EXTRA_PICTURE_URI takes an android.net.Uri
* Remove redundant documentation on setCallComposerStatus

Fixes: 182510687
Test: docs only
Change-Id: I43f776cf8bcb72c4121515536a3790cf44bf1638
diff --git a/telecomm/java/android/telecom/TelecomManager.java b/telecomm/java/android/telecom/TelecomManager.java
index 17749e8..1677c8c 100644
--- a/telecomm/java/android/telecom/TelecomManager.java
+++ b/telecomm/java/android/telecom/TelecomManager.java
@@ -314,8 +314,8 @@
     public static final String EXTRA_HAS_PICTURE = "android.telecom.extra.HAS_PICTURE";
 
     /**
-     * A URI representing the picture that was downloaded when a call is received or uploaded
-     * when a call is placed.
+     * A {@link Uri} representing the picture that was downloaded when a call is received or
+     * uploaded when a call is placed.
      *
      * This is a content URI within the call log provider which can be used to open a file
      * descriptor. This could be set a short time after a call is added to the Dialer app if the