Update README.md

README.md

@@ -30,7 +30,7 @@ Read this in other languages: [English][en-readme], [中文][zh-readme], [日本
       * [Session partner parameters](#session-partner-parameters)
       * [Delay start](#delay-start)
    * [Attribution callback](#attribution-callback)
-   * [Ad revenue tracking](#af-ad-revenue)
+   * [Ad revenue tracking](#ad-revenue)
    * [Event and session callbacks](#event-session-callbacks)
    * [Disable tracking](#disable-tracking)
    * [Offline mode](#offline-mode)
@@ -500,7 +500,7 @@ The delegate function will be called after the SDK receives the final attributio
 
 If any value is unavailable, it will default to `nil`.
 
-### <a id="af-ad-revenue"></a>Ad revenue tracking
+### <a id="ad-revenue"></a>Ad revenue tracking
 
 You can track ad revenue information with Adjust SDK by invoking following method: