Fix appearance of multiple API calls in console codeblock

[reakaleek]

Closes #1826

Changes

• Identify and render multiple API call headers in console codeblocks

Input

```console
PUT my-index-000001
{
  "mappings": {
    "enabled": false <1>
  }
}

PUT my-index-000001/_doc/session_1
{
  "user_id": "kimchy",
  "session_data": {
    "arbitrary_object": {
      "some_array": [ "foo", "bar", { "baz": 2 } ]
    }
  },
  "last_updated": "2015-12-06T18:20:22"
}

GET my-index-000001/_doc/session_1 <2>

GET my-index-000001/_mapping <3>
```
1. The entire mapping is disabled.
2. The document can be retrieved.
3. Checking the mapping reveals that no fields have been added.

Output

How to test

1. Copy the input to a markdown file somewhere in ./docs/**
2. Run dotnet run --project src/tooling/docs-builder -- serve
3. Validate the the output in the page you added the codeblock.

[github-actions]

🔍 Preview links for changed docs

• docs/syntax/code.md
• docs/testing/index.md

[lcawl]

Output looks like a good solution to me!

[leemthompo]

++ this is a great quick solution!

I wonder if removing the borders would make it 100% clear that this is one big (copyable) block, might be overthinking this though (and probably not worth the investment)

For reference, that's how it was handled in the old docs

[reakaleek]

++ this is a great quick solution!

I wonder if removing the borders would make it 100% clear that this is one big (copyable) block, might be overthinking this though (and probably not worth the investment)

For reference, that's how it was handled in the old docs

@leemthompo I made the borders darker and dotted to make the segments feel less separated.

I still think there is a benefit for the borders, readability wise. I also tried removing the borders, but IMO the spacing didn't look right.