Add more info re: disk slowness detected log msg

[rmloveland]

Fixes DOC-8286

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Files changed:

• src/current/v25.4/cluster-setup-troubleshooting.md

[rmloveland]

@jbowens adding you to review since this was discussed by you and Nick T here, hope that's ok. The doc issue has a linked ZD so at least one customer has hit this

hopefully quick review, just a couple paragraphs and bullets adding the disk slowness detected log message which unfortunately was not searchable in our docs until now 🤦

cc @dshjoshi FYI updating these docs

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[jbowens]

LGTM!

[rmloveland]

TFTR @jbowens ! I am planning to backport this change to the docs for everything v24.1 and later, is there any reason why this information would be any different for those prior versions? Sorry, meant to ask in my earlier msg and forgot

[peachdawnleach]

LGTM!