Documentation: Add section about the new \pager
command
#420
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About
There was another patch by @mfussenegger to be able to configure external pager programs.
This patch adds the corresponding documentation for the new feature.
Trivia
Other than the intended improvement, the PR also includes two other minor fixes/updates within separate commits.
NB: You may also want to review or acknowledge this? /cc @matriv, @seut, @hlcianfagna