Suggested bash doc improvements

After reading The new .atuin directory - #9 by AtomicRobotMan0101 I realized I may not be the target audience for the auto install script as I use the dotfile manager chezmoi (I definitely missed the script’s standard output because of this). I still think it’d be beneficial to call out/clarify the bash nuances but regardless I’m a happy user, only sharing in case it’s helpful. I appreciate that Atuin supports bash in the first place despite it’s shortcomings. :turtle: