feat(negative-binomial-variance): minor fixes

Author: Aadish Jain

lib/node_modules/@stdlib/stats/base/dists/negative-binomial/variance/README.md

@@ -168,7 +168,7 @@ for ( i = 0; i < 10; i++ ) {
 Returns the variance of a negative binomial distribution with parameters `r` (number of successes until experiment is stopped) and `p` (success probability).
 
 ```c
-double v = stdlib_base_dists_negative_binomial_variance( 100, 0.2 );
+double v = stdlib_base_dists_negative_binomial_variance( 100.0, 0.2 );
 // returns ~2000.0
 ```
 

lib/node_modules/@stdlib/stats/base/dists/negative-binomial/variance/include/stdlib/stats/base/dists/negative-binomial/variance.h

@@ -19,7 +19,6 @@
 #ifndef STDLIB_STATS_BASE_DISTS_NEGATIVE_BINOMIAL_VARIANCE_H
 #define STDLIB_STATS_BASE_DISTS_NEGATIVE_BINOMIAL_VARIANCE_H
 
-#include <stdint.h>
 
 /*
 * If C++, prevent name mangling so that the compiler emits a binary file having undecorated names, thus mirroring the behavior of a C compiler.