fix(Source): Fix broken code host doc links (#1096)

Author: mmanela

CHANGELOG.md

@@ -1016,7 +1016,7 @@ Re-release of 3.29.3 for Sourcegraph 3.30.
 
 ### Added
 
-- New command `src serve-git` which can serve local repositories for Sourcegraph to clone. This was previously in a command called `src-expose`. See [serving local repositories](https://docs.sourcegraph.com/admin/external_service/src_serve_git) in our documentation to find out more. [#12363](https://github.com/sourcegraph/sourcegraph/issues/12363)
+- New command `src serve-git` which can serve local repositories for Sourcegraph to clone. This was previously in a command called `src-expose`. See [serving local repositories](https://sourcegraph.com/docs/admin/code_hosts/src_serve_git) in our documentation to find out more. [#12363](https://github.com/sourcegraph/sourcegraph/issues/12363)
 - When used with Sourcegraph 3.18 or later, campaigns can now be created on GitLab. [#231](https://github.com/sourcegraph/src-cli/pull/231)
 
 ## 3.16.1

cmd/src/servegit.go

@@ -24,7 +24,7 @@ By default 'src serve-git' will recursively serve your current directory on the
 'src serve-git -list' will not start up the server. Instead it will write to stdout a list of
 repository names it would serve.
 
-Documentation at https://docs.sourcegraph.com/admin/external_service/src_serve_git
+Documentation at https://sourcegraph.com/docs/admin/code_hosts/src_serve_git
 `)
 	}
 	var (

internal/servegit/serve.go

@@ -253,7 +253,7 @@ func (s *Serve) Repos() ([]Repo, error) {
 func explainAddr(addr string) string {
 	return fmt.Sprintf(`Serving the repositories at http://%s.
 
-See https://docs.sourcegraph.com/admin/external_service/src_serve_git for
+See https://sourcegraph.com/docs/admin/code_hosts/src_serve_git for
 instructions to configure in Sourcegraph.
 `, addr)
 }