docs: fix comments

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---

Author: anandkaranubc

lib/node_modules/@stdlib/math/base/special/heaviside/lib/native.js

@@ -35,23 +35,23 @@ var str2enum = require( './str2enum.js' );
 * @returns {number} function value
 *
 * @example
-* var v = heaviside( 0.0, 0 );
+* var v = heaviside( 0.0, 'half-maximum' );
 * // returns 0.5
 *
 * @example
-* var v = heaviside( 0.0, 1 );
+* var v = heaviside( 0.0, 'left-continuous' );
 * // returns 0.0
 *
 * @example
-* var v = heaviside( 0.0, 2 );
+* var v = heaviside( 0.0, 'right-continuous' );
 * // returns 1.0
 *
 * @example
-* var v = heaviside( 0.0, 3 );
+* var v = heaviside( 0.0, 'discontinuous' );
 * // returns NaN
 *
 * @example
-* var v = heaviside( NaN, 2 );
+* var v = heaviside( NaN, 'right-continuous' );
 * // returns NaN
 */
 function heaviside( x, continuity ) {