'TRNG' acronym and references in Description.

* As requested for CRAN re-submission.

DESCRIPTION

@@ -11,9 +11,12 @@ Authors@R:
       person("Heiko", "Bauke", role = c("ctb", "cph"),
              comment = "TRNG sources and headers"))
 Description: Embeds sources and headers from Tina's Random
-    Number Generator C++ library. Exposes some functionality for easier
-    access, testing and benchmarking into R. Provides examples of how to
-    use parallel RNG with 'RcppParallel'.
+    Number Generator ('TRNG') C++ library. Exposes some functionality for
+    easier access, testing and benchmarking into R. Provides examples of
+    how to use parallel RNG with 'RcppParallel'. The methods and
+    techniques behind 'TRNG' are illustrated in the package vignettes and
+    examples. Full documentation is available in Bauke (2018)
+    <https://numbercrunch.de/trng/trng.pdf>.
 License: GPL-3
 URL: https://github.com/miraisolutions/rTRNG#readme,
     https://mirai-solutions.ch