Update API Example in backend to use the new /content/_search endpoint

[wezell]

We need to update this screen to show an example using the new /api/content/_search POST method

The example should display a curl example like:

curl -XPOST 'http://localhost:8080/api/content/_search' \
--header 'Content-Type: application/json' \
--data-raw '{
      	 "query": "+structurename:webpagecontent",
       	 "sort":"modDate",
       	 "limit":20,
       	 "offset":0
 }'

but with the correct values filled in. Be careful of escaping quotes as well.

Additionally we can remove the link to the xml example and just have the json example link that does the actual post and displays the results, rather than the GET link we have now.

[john-thomas-dotcms]

So just to be clear, I think we need to add a new example, not replace the existing one.

The existing example uses a GET, so it's easy to test from any browser, but I think the _search endpoint is a POST, which requires special tools (like postman). I think it's important that we keep a really easy to use example in there (without the need for a POST).

[john-thomas-dotcms]

In addition, it might also be a good time to think about adding a GraphQL example in there as well. We have alot more customers using this now, so an easy to find example could be really useful for them.

[alfredo-dotcms]

@wezell do you also want me to remove the XML href in the history tab? or just the one here:
https://user-images.githubusercontent.com/934364/101834754-bf49e400-3b08-11eb-8e06-913b1d1d76a2.png

[alfredo-dotcms]

PR: #19705

[wezell]

Looking good - a few things

• In the Dialog, let's wrap the code examples in a block and use a fixed width font.
• Use the short curl args, e.g. -H for --header and -d for data-raw
• Move the REST API Call URLEncoded below the post
• Use the POST for the JSON link
• replace the json for the link with the [API] icon
  

[alfredo-dotcms]

@wezell done:
a86f7d6

[alfredo-dotcms]

Preview

[nollymar]

Passed internal qa

[bryanboza]

Fixed, tested on release-21.02 // Postgres // FF