doc: remove v14 mention

PR-URL: nodejs/node#49005
Reviewed-By: Chemi Atlow <chemi@atlow.co.il>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: sercher

graal-nodejs/doc/contributing/maintaining/maintaining-openssl.md

@@ -13,8 +13,6 @@ currently need to generate four PRs as follows:
   of this guide.
 * a PR for 16.x following the instructions in the v16.x-staging version
   of this guide.
-* a PR for 14.x following the instructions in the [v14.x-staging version][]
-  of this guide.
 
 ## Use of the quictls/openssl fork
 
@@ -158,4 +156,3 @@ regenerated and committed by:
 Finally, build Node.js and run the tests.
 
 [update-openssl-action]: ../../../.github/workflows/update-openssl.yml
-[v14.x-staging version]: https://github.com/nodejs/node/blob/v14.x-staging/doc/guides/maintaining-openssl.md