chore: Updated link in readme leading to Decode Timestamp doc at w3.org (#1562)

Co-authored-by: Tobias Doll <tobias.doll@dw.com>

README.md

@@ -483,7 +483,7 @@ This option defaults to `false`.
 ##### useDtsForTimestampOffset
 * Type: `boolean`,
 * Default: `false`
-* Use [Decode Timestamp](https://www.w3.org/TR/media-source/#decode-timestamp) instead of [Presentation Timestamp](https://www.w3.org/TR/media-source/#presentation-timestamp) for [timestampOffset](https://www.w3.org/TR/media-source/#dom-sourcebuffer-timestampoffset) calculation. This option was introduced to align with DTS-based browsers. This option affects only transmuxed data (eg: transport stream). For more info please check the following [issue](https://github.com/videojs/http-streaming/issues/1247).  
+* Use [Decode Timestamp](https://www.w3.org/TR/media-source/#dfn-decode-timestamp) instead of [Presentation Timestamp](https://www.w3.org/TR/media-source/#presentation-timestamp) for [timestampOffset](https://www.w3.org/TR/media-source/#dom-sourcebuffer-timestampoffset) calculation. This option was introduced to align with DTS-based browsers. This option affects only transmuxed data (eg: transport stream). For more info please check the following [issue](https://github.com/videojs/http-streaming/issues/1247).  
 
 ##### useForcedSubtitles
 * Type: `boolean`