chore: update markdown description

Author: Neerajpathak07

lib/node_modules/@stdlib/stats/base/dists/gamma/mgf/README.md

@@ -194,7 +194,7 @@ for ( i = 0; i < 10; i++ ) {
 
 #### stdlib_base_dists_gamma_mgf( t, alpha, beta )
 
-Evaluates the moment-generating function (MGF) for a gamma distribution with shape parameter `alpha` and rate parameter `beta`.
+Evaluates the [moment-generating function][mgf] (MGF) for a [gamma][gamma-distribution] distribution with parameters `alpha` (shape parameter) and `beta` (rate parameter).
 
 ```c
 double y = stdlib_base_dists_gamma_mgf( 0.5, 0.5, 1.0 );