docs: fix variable name of main export in example code

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---

Author: Planeshifter

lib/node_modules/@stdlib/utils/every-by/lib/index.js

@@ -24,7 +24,7 @@
 * @module @stdlib/utils/every-by
 *
 * @example
-* var every = require( '@stdlib/utils/every-by' );
+* var everyBy = require( '@stdlib/utils/every-by' );
 *
 * function isPositive( v ) {
 *     return ( v > 0 );