Update splunk-integration-guide.mdx

[najeebcf]

Updating content with egress IP Address reference. Related to https://jira.cfdata.org/browse/CUSTESC-50151

Summary

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

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PR Change Summary

Updated the Splunk integration guide to include a reference to egress IP addresses for access control.

• Added a link to egress IP addresses for access control lists (ACLs) in the Splunk integration guide.
• Removed specific egress IP addresses from the documentation to streamline the content.

Modified Files

• src/content/docs/email-security/reporting/siem-integration/splunk-integration-guide.mdx

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