docs: fix return value interpolation

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---

Author: kgryte

lib/node_modules/@stdlib/math/base/special/binomcoefln/README.md

@@ -149,7 +149,7 @@ var opts = {
 var n = discreteUniform( 100, -10, 30, opts );
 var k = discreteUniform( 100, 0, 20, opts );
 
-logEachMap( 'ln( %d choose %d ) = %d', n, k, binomcoefln );
+logEachMap( 'ln( %d choose %d ) = %0.4f', n, k, binomcoefln );
 ```
 
 </section>

lib/node_modules/@stdlib/math/base/special/binomcoefln/examples/index.js

@@ -28,4 +28,4 @@ var opts = {
 var n = discreteUniform( 100, -10, 30, opts );
 var k = discreteUniform( 100, 0, 20, opts );
 
-logEachMap( 'ln( %d choose %d ) = %d', n, k, binomcoefln );
+logEachMap( 'ln( %d choose %d ) = %0.4f', n, k, binomcoefln );