chore: update markdown description

Author: Neerajpathak07

lib/node_modules/@stdlib/stats/base/dists/erlang/entropy/README.md

@@ -173,7 +173,7 @@ for ( i = 0; i < 10; i++ ) {
 
 #### stdlib_base_dists_erlang_entropy( k, lambda )
 
-Returns the differential entropy of an Erlang distribution with shape parameter `k` and rate parameter `lambda`.
+Returns the [differential entropy][entropy] of an [Erlang][erlang-distribution] distribution with parameters shape `k` and rate `lambda` (in [nats][nats]).
 
 ```c
 double y = stdlib_base_dists_erlang_entropy( 1.0, 1.0 );