fix: replace non-ASCII source comments

[santoslgl01-web]

Summary

Fixes #5664

• Replaced the remaining non-ASCII punctuation in source comments with ASCII equivalents.
• Kept the change limited to comments so generated code behavior is unchanged.

/claim #5664

Testing

• python3 byte scan confirmed no non-ASCII bytes remain in the issue-mentioned files (indra/llimagej2coj/llimagej2coj.cpp, indra/newview/llvelopack.cpp) and the two follow-up source files changed here (indra/llkdu/llimagej2ckdu.cpp, indra/llfilesystem/lldiskcache.cpp).
• git diff --check

[opirebot]

😅 Ups... the issue does not have any reward yet!

[github-actions]

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[santoslgl01-web]

\n I have read the CLA Document and I hereby sign the CLA\n

[santoslgl01-web]

recheck

[santoslgl01-web]

I have read the CLA Document and I hereby sign the CLA

[santoslgl01-web]

recheck

[santoslgl01-web]

Hi! Just checking in — please let me know if any changes are needed. Happy to update the PR. Thanks!