docs/cvs-migration: mention cvsimport caveats

Back when this guide was written, cvsimport was the only
game in town. These days it is probably not the best option.
Rather than go into details, let's point people to the note
at the top of cvsimport which gives other options.

Signed-off-by: Jeff King <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: peff

Documentation/gitcvs-migration.txt

@@ -116,6 +116,10 @@ they create are writable and searchable by other group members.
 Importing a CVS archive
 -----------------------
 
+NOTE: These instructions use the `git-cvsimport` script which ships with
+git, but other importers may provide better results. See the note in
+linkgit:git-cvsimport[1] for other options.
+
 First, install version 2.1 or higher of cvsps from
 https://github.com/andreyvit/cvsps[https://github.com/andreyvit/cvsps] and make
 sure it is in your path.  Then cd to a checked out CVS working directory