fixup: the help text is parsed as rst markup, so a lone * is an error

* and ** are interpreted as emphasis and need to be matched for begin
and end of emphasis. the \ in front of it is to get a non-markup *.

(cherry picked from commit 64a53ba43ae60ed746a1c68e243516456fb13128)

src/borg/archiver.py

@@ -4210,7 +4210,7 @@ class Archiver:
 
         It creates input data below the given PATH and backups this data into the given REPO.
         The REPO must already exist (it could be a fresh empty repo or an existing repo, the
-        command will create / read / update / delete some archives named borg-test-data* there.
+        command will create / read / update / delete some archives named borg-test-data\\* there.
 
         Make sure you have free space there, you'll need about 1GB each (+ overhead).