[Metrics][Docker] Add link to Docker available keys

[constanca-m]

What does this PR do?

This PR adds a new line to the conditions form of the Docker package, linking to the available keys.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

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• Start Time: 2023-01-09T16:14:34.030+0000

• Duration: 19 min 1 sec

Test stats 🧪

Test	Results
Failed	0
Passed	38
Skipped	0
Total	38

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (0/0)	💚
Files	100.0% (0/0)	💚 2.044
Classes	100.0% (0/0)	💚 2.044
Methods	96.667% (29/30)	👍 5.686
Lines	100.0% (0/0)	💚 8.457
Conditionals	100.0% (0/0)	💚

[MichaelKatsoulis]

As it is an enhancement it is better to go to next minor versions 2.5.0

[gsantoro]

it's just a link to docs in the UI. I am not sure it is worth adding a major version

[constanca-m]

I left it as 2.4.1 because it is something minimal, like @gsantoro said. Should I change it anyway? @MichaelKatsoulis

[MichaelKatsoulis]

Ok leave it as it is.

[MichaelKatsoulis]

Suggested change

	version: 2.4.1
	version: 2.5.0

[elasticmachine]

Package docker - 2.4.1 containing this change is available at https://epr.elastic.co/search?package=docker