doc: remove double word "where"

PR-URL: #29915
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

doc/guides/cve_management_process.md

@@ -39,7 +39,7 @@ advance. These CVEs are managed in a repository within the Node.js
 private organization called
 [cve-management](https://github.com/nodejs-private/cve-management).
 For each year there will be a markdown file titled "cve-management-XXXX"
-where where XXXX is the year (for example 'cve-management-2017.md').
+where XXXX is the year (for example 'cve-management-2017.md').
 
 This file will have the following sections: