RE: [PGdocs] fix description for handling pf non-ASCII characters

Dear Karl,

Thank you for reviewing!

> A related thing that's nice to have is to limit the line
> length of the documentation source to 80 characters or less.
> 79 is probably best.  Since the source text around your patch
> conforms to this convention you should also.

IIUC it is not hard limit, but I followed this.

> Should the committer be interested, your patch applies cleanly
> and the docs build as expected.

Yeah, but cfbot accepted previous version. Did you have anything in your mind?

> Also, based on the comments in the
> patch which changed the system's behavior, I believe that
> your patch updates all the relevant places in the documentation.

Thanks. Actually, I think it should be backpatched to PG16 because the commit was
done last year. I will make the patch for it after deciding the explanation.

> 
> I now think that you should consider another change to your wording.
> Instead of starting with "Characters that are not printable ASCII ..."
> consider writing "The bytes of the string which are not printable ASCII
> ...".  Notice above that characters (e.g. あ) generate output for
> each non-ASCII byte (e.g. \xe3\x81\x82).  So my thought is that
> the docs should be talking about bytes.
> 
> For the last hunk you'd change around "anything".  Write:
> "... it will be truncated to less than NAMEDATALEN characters and
> the bytes of the string which are not printable ASCII characters ...".
> 

Hmm, what you said looked right. But as Peter pointed out [1], the fix seems too
much. So I attached three version of patches. How do you think?
For me, type C is best.

A. A patch which completely follows your comments. The name is "v3-0001-...patch".
   Cfbot tests it.
B. A patch which completely follows Peter's comments [1]. The name is "Peter_v3-....txt".
C. A patch which follows both comments. Based on b, but some comments
   (Don't use the future tense, "Other characters"->"The bytes of other characters"...)
   were picked. The name is "Both_v3-....txt".

[1]: https://www.postgresql.org/message-id/CAHut%2BPvEbKC8ABA_daX-XPNOTFzuAmHGhjPj%3DtPZYQskRHECOg%40mail.gmail.com

Best Regards,
Hayato Kuroda
FUJITSU LIMITED