Update Javadocs for setCrashlyticsCollectionEnabled API (firebase#1850)

Author: mrwillis21

firebase-crashlytics/src/main/java/com/google/firebase/crashlytics/FirebaseCrashlytics.java

@@ -444,10 +444,10 @@ public boolean didCrashOnPreviousExecution() {
  }
 
  /**
- * Enables/disables automatic data collection by Crashlytics.
+ * Enables or disables the automatic data collection configuration for Crashlytics.
  *
- * <p>If this is set, it overrides the data collection settings provided by the Android Manifest,
- * as well as any Firebase-wide automatic data collection settings.
+ * <p>If this is set, it overrides any automatic data collection settings configured in the
+ * AndroidManifest.xml as well as any Firebase-wide settings.
  *
  * <p>If automatic data collection is disabled for Crashlytics, crash reports are stored on the
  * device. To check for reports, use the {@link #checkForUnsentReports()} method. Use {@link
@@ -456,28 +456,31 @@ public boolean didCrashOnPreviousExecution() {
  * sending them to Crashlytics.
  *
  * @param enabled whether to enable automatic data collection. When set to `false`, the new value
- * does not apply until the next run of the app. If you want to disable data collection by
- * default for all app runs, add the `firebase_crashlytics_collection_enabled` flag to your
- * app's AndroidManifest.xml.
+ * does not apply until the next run of the app. To disable data collection by default for all
+ * app runs, add the `firebase_crashlytics_collection_enabled` flag to your app's
+ * AndroidManifest.xml.
  */
  public void setCrashlyticsCollectionEnabled(boolean enabled) {
  core.setCrashlyticsCollectionEnabled(enabled);
  }
 
  /**
- * Enables/disables/clears automatic data collection config by Crashlytics.
+ * Enables or disables the automatic data collection configuration for Crashlytics.
  *
- * <p>If this is set, it overrides the data collection settings provided by the Android Manifest,
- * as well as any Firebase-wide automatic data collection settings.
+ * <p>If this is set, it overrides any automatic data collection settings configured in the
+ * AndroidManifest.xml as well as any Firebase-wide settings. If set to `null`, the override is
+ * cleared.
  *
  * <p>If automatic data collection is disabled for Crashlytics, crash reports are stored on the
  * device. To check for reports, use the {@link #checkForUnsentReports()} method. Use {@link
  * #sendUnsentReports()} to upload existing reports even when automatic data collection is
  * disabled. Use {@link #deleteUnsentReports()} to delete any reports stored on the device without
  * sending them to Crashlytics.
  *
- * @param enabled whether to enable automatic data collection. The value of null would clear the
- * Crashlytics config and the enablement of data collection would depend on other settings.
+ * @param enabled whether to enable or disable automatic data collection. When set to `false`, the
+ * new value does not apply until the next run of the app. When set to `null`, the override is
+ * cleared and automatic data collection settings are determined by the configuration in your
+ * AndroidManifest.xml or other Firebase-wide settings.
  */
  public void setCrashlyticsCollectionEnabled(@Nullable Boolean enabled) {
  core.setCrashlyticsCollectionEnabled(enabled);