General purpose reformating and rewording in (a few places). This should
also make markdown linting happier.
Prefer back-ticks wherever useful and use `console` for code blocks to
be executed on terminal.
Also, update references links wherever possible (including update from
'http://' to 'https://').
* Add perl-info function
* Add alias for plenv subcommands
* Load perlbrew if needed
* Load plenv if needed
* Use PERLBREW_ROOT as priority to detect Perlbrew
Indrajit Raychaudhuri