doc: Document '%state-monad' and update '%store-monad' description.

* doc/guix.texi (The Store Monad): Document '%state-monad' and related
  procedures.  Describe '%store-monad' as an alias for '%state-monad'.
* guix/monads.scm: Update commentary.

1 files changed, 1 insertions, 1 deletions

diff --git a/guix/monads.scm b/guix/monads.scm
index 62397dae7c..5bb860aadd 100644
--- a/guix/monads.scm
+++ b/guix/monads.scm
@@ -60,7 +60,7 @@
 ;;; Commentary:
 ;;;
 ;;; This module implements the general mechanism of monads, and provides in
-;;; particular an instance of the "store" monad.  The API was inspired by that
+;;; particular an instance of the "state" monad.  The API was inspired by that
 ;;; of Racket's "better-monads" module (see
 ;;; <http://planet.racket-lang.org/package-source/toups/functional.plt/1/1/planet-docs/better-monads-guide/index.html>).
 ;;; The implementation and use case were influenced by Oleg Kysielov's