Update OWNERS.md

add tech doc maintainer

Signed-off-by: Vojtech Burian <vojta@spotify.com>

Author: Vojtech Burian

OWNERS.md

@@ -100,6 +100,7 @@ Scope: The TechDocs plugin and related tooling
 | Morgan Bentell           | Spotify      | ProTean | [agentbellnorm](http://github.com/agentbellnorm)  | `morganbentell`     |
 | Raghunandan Balachandran | Spotify      | BUX     | [soapraj](http://github.com/soapraj)              | `raghunandanb#1114` |
 | Sydney Achinger          | Spotify      | ProTean | [squid-ney](https://github.com/squid-ney)         | -                   |
+| Vojta Burian             | Spotify      | ProTean | [sankaritan](https://github.com/sankaritan)       | `vojtabu`           |
 
 ## Incubating Project Areas