correcting cockroachlabs link

Signed-off-by: Nate W <4453979+nate-double-u@users.noreply.github.com>

content/docs/v3.2/learning/why.md

@@ -77,7 +77,7 @@ In theory, it’s possible to build these primitives atop any storage systems pr
 
 For distributed coordination, choosing etcd can help prevent operational headaches and save engineering effort.
 
-[cockroach-grant]: https://www.cockroachlabs.com/docs/grant.html
+[cockroach-grant]: https://www.cockroachlabs.com/docs/v20.2/grant.html
 [cockroach]: https://github.com/cockroachdb/cockroach
 [consul-acl]: https://www.consul.io/docs/security/acl
 [consul-bulletproof]: https://www.consul.io/docs/dynamic-app-config/sessions