Remove mention of "ls -F" option about shell-novice HOT 3 OPEN

Thanks for the suggestion. it is introduced in 02-filedir.md and also used extensively in 03-create.md. Other options for ls are introduced as well. In cases where color highlighting is not available ls -F does seem useful to distinguish between files and directories when someone is new to the shell. Timestamp information, file size information and listing hidden files/folders is also introduced but is more helpful for intermediate users.

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Would a quick example using ls -a, ls -l, or ls -al in 02-filedir.md be an acceptable compromise? I'd be willing to do the PR.

On a personal note, ls -F is useful enough to me that I have put alias ls='ls -F' in my login scripts for decades, and now do the same in the login scripts for my lab. Even if LS_COLORS is set up properly, the specific colors used can differ between distros and OSes, so the -F signifiers are still the only reliable indicator of symlinks and directories, unless you use ls -l.

To preempt new users' temptation to parse the output of ls from scripts, we introduce find as the "right tool for the job" early in our onboarding training.

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From #1351 mentioning case may also be helpful and ls -F seems a good choice for this. Using ls -al is helpful. A pull request would be appreciated.

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