Re: GUC-ify walsender MAX_SEND_SIZE constant

Something to be aware of, but the community lists use bottom-posting
for replies because it is easier to follow the logic of a thread this
way.  See here:
https://en.wikipedia.org/wiki/Posting_style#Bottom-posting

Thanks for the patch, that looks rather fine.  I have spent some time
polishing the docs, adding a mention that increasing the value can
show benefits depending on what you do.  How does the attached look to
you?