Fix typos, reword the description of the lsl command

Add a period at the end of each sentence for consistency.
Change the remaining verbs to their imperative form (again, for consistency).
The default `rclone lsl` output is size, modification time and path, so reword the command description to reflect that.
Correct various typos.
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Internal Server Error - Gitea: Git with a cup of tea
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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f