I find a bug about 'quick start',and created a new issues,Sean Owen  let
me to make a pull request, and I do

## What changes were proposed in this pull request?

(Please fill in changes proposed in this fix)

## How was this patch tested?

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(If this patch involves UI changes, please attach a screenshot; otherwise, remove this)

Please review http://spark.apache.org/contributing.html before opening a pull request.

Author: Trueman <lizhaoch@users.noreply.github.com>
Author: lizhaoch <lizhaoc@163.com>

Closes #18722 from lizhaoch/master.