[Logs] Update Logpush to Splunk

[cicku]

Summary

Do not differentiate between Splunk Cloudflare or Splunk Enterprise.

Documentation checklist

• The documentation style guide has been adhered to.

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PR Change Summary

Updated Logpush documentation to unify references to Splunk and enhance clarity on using the HTTP Event Collector.

• Removed differentiation between Splunk Cloudflare and Splunk Enterprise.
• Clarified the use of the HTTP Event Collector (HEC) for log pushing.
• Updated terminology from 'Splunk raw HTTP Event Collector URL' to 'Splunk HEC URL'.
• Improved instructions for entering destination details and submitting logpush jobs.

Modified Files

• src/content/docs/logs/get-started/enable-destinations/splunk.mdx

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[soheiokamoto]

I think we can remove this line, as I believe any port is allowed now.