Eli Zaretskii <eliz@gnu.org> writes:
>
> Our coding conventions put the logical operators at the beginning of a
> line, not at EOL.

Fixed this, and added documentation.  Also, watcher functions are now
listed in describe-variable output.

Does it make sense to mention the use of the `watchers' symbol property
in the manual?  Since I've added a `get-variable-watchers' it's now
possible to ignore the symbol property as an implementation detail.