docs: fix example

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---

Author: kgryte

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

@@ -554,11 +554,11 @@ setReadWriteAccessor( Axis.prototype, 'domainWidth', getDomainWidth, setDomainWi
 * var axis = new Axis({
 *     'scale': 'xScale',
 *     'orient': 'bottom',
-*     'format': '%d'
+*     'format': '.1f'
 * });
 *
 * var v = axis.format;
-* // returns '%d'
+* // returns '.1f'
 */
 setReadWriteAccessor( Axis.prototype, 'format', getFormat, setFormat );