[m-rev.] for review: reword an entry in the samples README

[Julien Fischer]

For review by anyone.

---------------------

Reword an entry in the samples README.

samples/README.md:
     As above.

Julien.

diff --git a/samples/README.md b/samples/README.md
index 09f90ab14..c65622884 100644
--- a/samples/README.md
+++ b/samples/README.md
@@ -73,8 +73,8 @@ Mercury programs:
  * [muz](muz) -- This directory contains a syntax checker / type checker for the
    specification language Z.

-* [solver_types](solver_types) -- This directory contains an example solver
-  type implementation, and some sample applications.
+* [solver_types](solver_types) -- This directory contains an example of a
+  simple constraint solver implemented using solver types.

  * [lazy_list](lazy_list) -- This directory contains an example of how the
    `lazy` module in the standard library can be used to implement a lazy data