doc: fix typos in CONTRIBUTING.md

Remove incorrect usage of "in which". The sentence is better and shorter
without it anyway. Replace incorrect "with" with "in".

PR-URL: #17930
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Weijia Wang <[email protected]>
Reviewed-By: Jon Moss <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Anatoli Papirovski <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: Gireesh Punathil <[email protected]>
Reviewed-By: Yuta Hiroto <[email protected]>

Author: Trott

CONTRIBUTING.md

@@ -199,9 +199,8 @@ functional guidelines of the Node.js project.
 
 ## Pull Requests
 
-Pull Requests are the way in which concrete changes are made to the code,
-documentation, dependencies, and tools contained with the `nodejs/node`
-repository.
+Pull Requests are the way concrete changes are made to the code, documentation,
+dependencies, and tools contained in the `nodejs/node` repository.
 
 There are two fundamental components of the Pull Request process: one concrete
 and technical, and one more process oriented. The concrete and technical