service: fix 'occured' -> 'occurred' in DiskErrorsHandlerService messages

[SAY-5]

Two messages in src/java/org/apache/cassandra/service/DiskErrorsHandlerService.java (lines 57, 62) read Exception occured while. Fixed to occurred. One is a logger.warn string, the other a ConfigurationException message. String-literal-only change.

[pmcfadin]

Thanks for the contribution, but the level of testing in our ecosystem is much higher than most. While this seems like a very simple change, it may actually break a test somewhere. Would you be willing to do a more general set of spell checks across all messages and validate that the changes don't break anything? Since this is touching a java file, we will require a dtest run to validate it didn't create regressions.

You can learn more about that here: https://cassandra.apache.org/_/development/testing.html

[SAY-5]

Closing — typo-only PR. Multiple maintainers across the OSS ecosystem have flagged my recent typo-sweep PRs as AI-generated spam (notably hashicorp/nomad#27855, hashicorp/hcl#794, argo-cd reviewers). I should have caught this pattern sooner. Apologies for the noise.