Deep linking example links to wrong channel

[wlaoh]

On the deep linking page the example at the top says Open #general but it actually links to #random.

I propose changing the element there from:

<a href="https://slack.com/app_redirect?channel=random" class="btn blue_fill_bg">Open #general</a>

to

<a href="https://slack.com/app_redirect?channel=general" class="btn blue_fill_bg">Open #general</a>