bug#72024: documentation suggestion: make old versions of docs easily available

[mark.yagnatinsky]

If go to the website of say, Perl or Python, and I see there's a cool function 
I want to use, then often there will be a note "new in version X.Y".
Then I know that if I need to support versions older than that, I can't use it, 
and otherwise I can.
If there is no such note, then I also have the option of easily pulling up old 
versions of the docs.
So I can quickly grab the docs for the oldest version I care about, and see if 
the function exists there.

Most GNU software (e.g., bash, coreutils, etc.) makes the latest version easily 
available on the website, but not older versions.
(The older versions are indeed available, but not require downloading and 
unzipping the full source distribution, or a similar level of annoyance.)
This is sometimes fine, since if I need to support some ancient version, then 
presumably I have access to at least one machine where that version is 
installed, and that machine will often have docs installed too.
But it's still nice to know whether I'm "skating close to the edge" or whether 
I'm using stuff that was already supported last century.

Just my two cents.
Mark.

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