fortiedr: improve syslog set-up documentation

[efd6]

What does this PR do?

This clarifies the syslog notification setup process.

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.

Author's Checklist

• [ ]

How to test this PR locally

Related issues

• For Fortinet FortiEDR #1190.

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• Start Time: 2022-12-01T00:14:05.759+0000

• Duration: 15 min 21 sec

Test stats 🧪

Test	Results
Failed	0
Passed	7
Skipped	0
Total	7

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (1/1)	💚 11.111
Classes	100.0% (1/1)	💚 11.111
Methods	100.0% (12/12)	💚 14.103
Lines	95.349% (205/215)	👍 0.22
Conditionals	100.0% (0/0)	💚

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

[kcreddy]

LGTM

[elasticmachine]

Package fortinet_fortiedr - 1.2.0 containing this change is available at https://epr.elastic.co/search?package=fortinet_fortiedr