docs: the pane you are in, the pane you name, and not moving the view

$SLOSH_PANE in the man page's environment list, next to SLOSH and
SLOSH_SESSION, and the scripting guide grows the section that follows from
it: read yourself with `capture`, build with `apply-layout focus:false`,
place with `move-pane beside`, and never read `focused` as "where do I
live". `pid` is written down as the answer for anything that cannot read
its own environment.

(Three roff \(em escapes had got into the markdown table; they are em
dashes like the rest of the file.)

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