I always use or in such situations, and I dislike perldocs which do otherwise
So do I. I also dislike the use of $a and $b in docs as metasyntactic variables as they are subsequently used in cargo-culted code and become the cause of errors. There are, after all, plenty of others to choose from.
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Want more info? How to link or
or How to display code and escape characters
are good places to start.