[css-fonts-4] add chrome fpv bug link

Author: svgeesus

css-fonts-4/Overview.bs

@@ -6187,6 +6187,13 @@ the creation of an entirely different palette.
 ██        ██     ██ ████████ ████████    ██       ██    ████████
 -->
 
+<!--
+	Implementations:
+
+	Chromium Issue 1170794: Support font-palette
+	https://bugs.chromium.org/p/chromium/issues/detail?id=1170794
+-->
+
 <h3 id="font-palette-prop">
 Controlling Color Font Palettes: The 'font-palette' property</h3>