gnu: libdmtx: Edit description.

* gnu/package/aidc.scm (libdmtx)[description]: Replace redundant OS
information with fascinating barcode facts.

gnu/packages/aidc.scm

@@ -99,6 +99,6 @@ (define-public libdmtx
     (home-page "https://github.com/dmtx")
     (synopsis "Library for reading and writing Data Matrix 2D barcodes")
     (description "libdmtx is software for reading and writing Data Matrix 2D
-barcodes on Linux and Unix.  At its core libdmtx is a shared library, allowing
+barcodes of the modern ECC200 variety.  libdmtx is a shared library, allowing
 C/C++ programs to use its capabilities without restrictions or overhead.")
     (license license:bsd-3)))