docs: fix type

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---

Author: kgryte

lib/node_modules/@stdlib/plot/vega/title/ctor/lib/main.js

@@ -720,7 +720,7 @@ setReadWriteAccessor( Title.prototype, 'text', getText, setText );
 *
 * @name zindex
 * @memberof Title.prototype
-* @type {string}
+* @type {number}
 * @default 0
 *
 * @example