doc: clarify process.title inconsistencies

Many users assume the act of assigning a value to `process.title` will
update the name of their application in apps like macOS Activity Monitor
or Windows Services Manager. This has worked in the past, but fails in
some versions of Node.js. Ultimately developers are left confused,
especially when it works in one version of Node.js and not another.
Given the recurring nature and complexity of the underlying problem, it
does not seem like a resolvable problem. This note clarifies the source
of the problem, sets developer expectations.

Refs: https://github.com/nodejs/node/issues/28945
PR-URL: https://github.com/nodejs/node/pull/34557
Fixes: https://github.com/nodejs/node/issues/34280


Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>