bug#3314: 23.0.93; Emacs manual, node RegPos

> The reason for abbreviating some node names is to prevent the node's
> first line (in the Info file) from wrapping in an ugly way.

Not a good solution, IMO.

Even if no good solution for the wrapping problem could be found, it is more
important that nodes have helpful names than that wrapping be avoided.

And a name can be helpful without being overly long.

And this and the other node names in this section would not be longer than most
if named normally: `Positional Register' as a  substitute for `RegPos' is not
longer than most other nodes.

I suspect that the reason we have RegPos and company is simply an oversight -
perhaps laziness or unconcern on the part of whoever named them.

Further evidence that this is an oversight is that the author didn't even use
`Reg Pos'. There is zero reason to use camelCase here.