update index.js

Author: shubham220420

lib/node_modules/@stdlib/stats/base/dists/halfnormal/variance/README.md

@@ -174,6 +174,7 @@ Returns the variance for a [half-normal][half-normal-distribution] distribution
 double out = stdlib_base_dists_halfnormal_variance( 1.0 );
 // returns ~0.3633802276
 ```
+
 The function accepts the following arguments:
 
 -   **sigma**: `[in] double` scale parameter.

lib/node_modules/@stdlib/stats/base/dists/halfnormal/variance/examples/index.js

@@ -27,4 +27,4 @@ var opts = {
 };
 var sigma = uniform( 10, 0.0, 20.0, opts );
 
-logEachMap( 'σ: %0.4f, Var(X;σ): %0.4f', sigma, variance );
+logEachMap( 'σ: %lf, Var(X;σ): %lf', sigma, variance );