CmdRunner guide (#8592) * initial commit * wip * WIP * progressing * remove copied part * progressing * document as_func() * complete docs about arg formatting * add PythonRunner documentation * fix markup * improve markup * multiple changes - revamp the cmd_runner_fmt doc - add CmdRunner instance and context parameters - changed formatting of other blocks * fix typo + reduce tables sizes * improve text * fixes and adjustments * fix sanity * fix version added (cherry picked from commit b0797d329c) Co-authored-by: Alexei Znamensky <103110+russoz@users.noreply.github.com>
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