[docs] Escape left angle bracket (<)

[colleenmcginnis]

Related: #4295

What does this PR do?

Escapes the left angle bracket (<) used in the new Infoblox BloxOne DDI doc.

The Integration docs use MDX (not plain Markdown). From the MDX documentation:

Unescaped left angle bracket / less than (<) and left curly brace ({) have to be escaped: \< or \{ (or use expressions: {'<'}, {'{'})

I used \< because it also renders correctly in plain Markdown (see Screenshots below).

Note: This PR also removes the "Overview" heading, which will be added when the file is processed from a Markdown file to an MDX file. Though including the "Overview" heading here doesn't break the build, it does result in two "Overview" headings on the page for this integration on docs.elastic.co.

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.

Screenshots

[efd6]

LGTM after nit.

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• Start Time: 2022-10-03T21:52:35.809+0000

• Duration: 17 min 21 sec

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (3/3)	💚
Files	100.0% (3/3)	💚 2.569
Classes	100.0% (3/3)	💚 2.569
Methods	100.0% (39/39)	💚 9.972
Lines	98.278% (2568/2613)	👍 6.755
Conditionals	100.0% (0/0)	💚

[bmorelli25]

@colleenmcginnis FYI we need to be careful with arrows. This one is fine, but if it had two dashes (-->) it would be considered an HTML comment and replaced.

https://github.com/elastic/wordlake/blob/main/utils/integrations-exporter/content/content.go#L38