doc: Make logical replication examples executable in bulk and legal sgml.

On Thursday, May 22, 2025, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:

> On Sat, May 3, 2025 at 9:33 PM David G. Johnston
> <david(dot)g(dot)johnston(at)gmail(dot)com> wrote:
> >
> > While responding to a "our documentation is buggy" complaint I got
> annoyed in my attempt to reproduce the behavior by having to surgically
> copy line-by-line the DDL and DML code involved. Let's strive for a more
> copy-paste friendly example setup. No prompts and no interspersed command
> tags (they are ok if the script is one block and the output is another).
> >
>
> That's a valid point. Since this is not a correctness issue, I am less
> inclined to backpatch. What do you or others think?
>

Agreed, this would not be back-patched.

David J.