Revise javadoc of EXTRA_FROM_TEXT_CLASSIFIER

Test: make

FIXES: 123223220

Change-Id: I4e79cab261a3540cc94d2cf19950f5cba22e06fe
diff --git a/core/java/android/view/textclassifier/TextClassifier.java b/core/java/android/view/textclassifier/TextClassifier.java
index 5a56136..8a688d8 100644
--- a/core/java/android/view/textclassifier/TextClassifier.java
+++ b/core/java/android/view/textclassifier/TextClassifier.java
@@ -164,9 +164,10 @@
     TextClassifier NO_OP = new TextClassifier() {};
 
     /**
-     * Used as a boolean value to indicate the intent is generated by TextClassifier.
+     * Extra that is included on activity intents coming from a TextClassifier when
+     * it suggests actions to its caller.
      * <p>
-     * All {@link TextClassifier} implementations should set this boolean extra to be true in their
+     * All {@link TextClassifier} implementations should make sure this extra exists in their
      * generated intents.
      */
     String EXTRA_FROM_TEXT_CLASSIFIER = "android.view.textclassifier.extra.FROM_TEXT_CLASSIFIER";