Fixes some typos as found by codespell run on the code.
In this commit, I was hoping to fix only comments, not user-visible alerts, output, etc.
Follow-up commits will take care of them.
Refs: https://github.com/scylladb/scylladb/issues/16255
Signed-off-by: Yaniv Kaul <yaniv.kaul@scylladb.com>
A distinct exception derived from std::bad_alloc, used in cases when
memory didn't really run out, but the process or task reached the memory
limit alloted for it. Using a distinct type for this case allows for LSA
to correctly react to this case.
