[darktrace] docs: escape <>

[bmorelli25]

The new darktrace readme is breaking the docs.elastic.co build. < and > need to either be escaped or in code snippets/blocks. This PR updates the docs to fix the build.

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Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

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• Start Time: 2022-10-09T18:51:57.846+0000

• Duration: 24 min 17 sec

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Test	Results
Failed	0
Passed	29
Skipped	0
Total	29

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (3/3)	💚
Files	100.0% (3/3)	💚 2.496
Classes	100.0% (3/3)	💚 2.496
Methods	100.0% (46/46)	💚 9.666
Lines	95.645% (2350/2457)	👍 4.014
Conditionals	100.0% (0/0)	💚