Link to unsafe-escaping section of how-to doc (#4545)

* Link to unsafe-escaping section of how-to doc

* Update xml/System.Text.Encodings.Web/JavaScriptEncoder.xml

Co-authored-by: Youssef Victor <[email protected]>

Co-authored-by: Youssef Victor <[email protected]>

Author: tdykstra

xml/System.Text.Encodings.Web/JavaScriptEncoder.xml

@@ -192,6 +192,8 @@ Unlike the <xref:System.Text.Encodings.Web.JavaScriptEncoder.Default> encoding (
 
 Unlike the <xref:System.Text.Encodings.Web.JavaScriptEncoder.Default> encoder, this encoder instance allows some other characters (such as '+') to go through unescaped and therefore must be used cautiously.
 
+For more information, see [Serialize all characters](/dotnet/standard/serialization/system-text-json-how-to#serialize-all-characters).
+
           ]]></format>
         </remarks>
       </Docs>