gnu: guile-minikanren: Fix README location.

* gnu/packages/guile.scm (minikanren): Fix output location for README.org

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu/packages/guile.scm

@@ -419,7 +419,7 @@ (define-public guile-minikanren
          (let* ((out (assoc-ref %outputs "out"))
                 (module-dir (string-append out "/share/guile/site/2.0"))
                 (source (assoc-ref %build-inputs "source"))
-                (doc (string-append out "/share/doc"))
+                (doc (string-append out "/share/doc/guile-minikanren"))
                 (scm-files '("minikanren.scm"
                              "minikanren/mkextraforms.scm"
                              "minikanren/mkprelude.scm"