fix: fixed lib/index.js example

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---

Author: sagar7162

lib/node_modules/@stdlib/optimize/base/brentq/lib/index.js

@@ -24,14 +24,17 @@
 * @module @stdlib/optimize/base/brentq
 *
 * @example
+* var sin = require( '@stdlib/math/base/special/sin' );
 * var brentq = require( '@stdlib/optimize/base/brentq' );
 *
 * function f( x ) {
-*    return Math.sin( x );
+*    return sin( x );
 * }
 *
-* var root = brentq( f, 3.0, 3.2 );
-* // returns ~3.14
+* var out = brentq( f, 3.0, 4.0, 100, 1.0e-12, 8.88e-16, [] );
+* var root = out.root;
+* console.log( root );
+* // => ~3.14
 */
 
 // MODULES //