[fix](storage) Fix typo 'occured' in user-facing error messages

[MukundaKatta]

What problem does this PR solve?

Nine error messages in the storage BE misspell 'occurred' as 'occured'. Because these strings are returned in runtime Status error messages, they are visible to end users hitting inverted-index build/read errors and storage-engine init errors.

Files changed

• be/src/storage/index/inverted/inverted_index_reader.cpp — 3 occurrences
• be/src/storage/task/index_builder.cpp — 5 occurrences
• be/src/storage/storage_engine.cpp — 1 occurrence

Each change is to the error-message string only; no behavior change.

Release note

None

[hello-stephen]

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