update Sophos readme

[ellis-elastic]

updated the readme file to include links to Sophos's documentation. Also used the latest product name for Astaro

Type of change

• Enhancement

What does this PR do?

updated the readme file to include links to Sophos's documentation. Also used the latest product name for Astaro

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

• [ ]

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[elasticmachine]

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• Start Time: 2022-06-15T08:35:48.719+0000

• Duration: 19 min 48 sec

Test stats 🧪

Test	Results
Failed	0
Passed	31
Skipped	0
Total	31

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (2/2)	💚
Files	100.0% (13/13)	💚 3.432
Classes	100.0% (13/13)	💚 3.432
Methods	98.901% (90/91)	👍 9.569
Lines	94.432% (1747/1850)	👍 4.497
Conditionals	100.0% (0/0)	💚

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

[r00tu53r]

Looks good. Just a minor observation. Also there appears to be a version conflict (changelog.yml and manifest.yml).