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Add a section with a few rules of thumb about how
quickly developers should address regressions to
Documentation/process/handling-regressions.rst; additionally,
add a short paragraph about this to the companion document
Documentation/admin-guide/reporting-regressions.rst as well.

The rules of thumb were written after studying the quotes from Linus
found in handling-regressions.rst and especially influenced by
statements like "Users are literally the _only_ thing that matters" and
"without users, your program is not a program, it's a pointless piece of
code that you might as well throw away". The author interpreted those in
perspective to how the various Linux kernel series are maintained
currently and what those practices might mean for users running into a
regression on a small or big kernel update.

That for example lead to the paragraph starting with "Aim to get fixes
for regressions mainlined within one week after identifying the c...