docs: fix return annotation value

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---

Author: Planeshifter

lib/node_modules/@stdlib/assert/is-constantcase/lib/main.js

@@ -40,7 +40,7 @@ var constantcase = require( '@stdlib/string/base/constantcase' );
 * // returns false
 *
 * bool = isConstantcase( 'BEEP-BOOP' );
-* // returns true
+* // returns false
 *
 * bool = isConstantcase( 'beep boop' );
 * // returns false