[wv-docs] Document force dark default, and behaviour of FORCE_DARK_AUTO

This adds a reference to the View method that controls framework force
dark, which impacts how FORCE_DARK_AUTO is interpreted. It also
documents that FORCE_DARK_AUTO is the default.

Test: documentation only change
Fixes: 128704481
Change-Id: I88e7996362da5b092b269c313e37ef9253b12872
diff --git a/core/java/android/webkit/WebSettings.java b/core/java/android/webkit/WebSettings.java
index 494eb03..a46580d 100644
--- a/core/java/android/webkit/WebSettings.java
+++ b/core/java/android/webkit/WebSettings.java
@@ -245,10 +245,11 @@
     /**
      * Used with {@link #setForceDark}
      *
-     * Enable force dark, dependent on the state of the WebView parent. If the WebView parent view
-     * is being automatically rendered in dark mode, then WebView content will be rendered so as to
-     * emulate a dark theme. WebViews that are not attached to the view hierarchy will not be
-     * inverted.
+     * Enable force dark dependent on the state of the WebView parent view. If the WebView parent
+     * view is being automatically force darkened
+     * (see: {@link android.view.View#setForceDarkAllowed}), then WebView content will be rendered
+     * so as to emulate a dark theme. WebViews that are not attached to the view hierarchy will not
+     * be inverted.
      */
     public static final int FORCE_DARK_AUTO = 1;
 
@@ -1466,6 +1467,8 @@
 
     /**
      * Set the force dark mode for this WebView.
+     *
+     * @param forceDark the force dark mode to set.
      */
     public void setForceDark(@ForceDark int forceDark) {
         // Stub implementation to satisfy Roboelectrc shadows that don't override this yet.
@@ -1474,6 +1477,8 @@
     /**
      * Get the force dark mode for this WebView.
      *
+     * The default force dark mode is {@link #FORCE_DARK_AUTO}
+     *
      * @return the currently set force dark mode.
      */
     public @ForceDark int getForceDark() {