[docs] Escape less than symbol (<)

[colleenmcginnis]

What does this PR do?

Escapes the less than symbol (<) used in the new Collective Intelligence Framework v3 Integration docs.

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).

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

[elasticmachine]

🚀 Benchmarks report

To see the full report comment with /test benchmark fullreport

[elasticmachine]

💚 Build Succeeded

the below badges are clickable and redirect to their specific view in the CI or DOCS

Expand to view the summary

Build stats

• Start Time: 2022-09-27T01:43:17.247+0000

• Duration: 14 min 14 sec

Test stats 🧪

Test	Results
Failed	0
Passed	11
Skipped	0
Total	11

🤖 GitHub comments

Expand to view the GitHub comments

To re-run your PR in the CI, just comment with:

• /test : Re-trigger the build.

[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (1/1)	💚 2.582
Classes	100.0% (1/1)	💚 2.582
Methods	85.714% (12/14)	👎 -4.224
Lines	39.615% (103/260)	👎 -51.749
Conditionals	100.0% (0/0)	💚

[efd6]

LGTM after conflicts and PR link and are resolved.

[efd6]

LGTM. Thanks