Update links in cvs.md

Link to cvs-fast-export documentation has changed and now points to
Reposurgeon. The source code is available and other documentation
describes how to use it.

doc/user/project/import/cvs.md

@@ -69,7 +69,8 @@ Migrating to Git/GitLab will benefit you:
 
 Here's a few links to get you started with the migration:
 
-- [Migrate using the `cvs-fast-export` tool](http://www.catb.org/~esr/reposurgeon/dvcs-migration-guide.html) ([_source code_](https://gitlab.com/esr/cvs-fast-export))
+- [Migrate using the `cvs-fast-export` tool](https://gitlab.com/esr/cvs-fast-export)
 - [Stack Overflow post on importing the CVS repo](https://stackoverflow.com/a/11490134/974710)
 - [Convert a CVS repository to Git](https://www.techrepublic.com/blog/linux-and-open-source/convert-cvs-repositories-to-git/)
 - [Man page of the `git-cvsimport` tool](https://mirrors.edge.kernel.org/pub/software/scm/git/docs/git-cvsimport.html)
+- [Migrate using `reposurgeon`](http://www.catb.org/~esr/reposurgeon/repository-editing.html#conversion)