MNT: Discourage alternate strings for 'none' linestyle #29343
Merged
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Inspired by but independent of the discussion around the representation of linestyles #29304.
For other linestyles we have a short visual representation (e.g. "--") and a name (e.g."dashed"). "No linestyle" currently has four accepted writings "", " ", "none", "None".
This PR recommends only to use "" (visual representation) and "none" (named representation). It discourages " " and "None". This should guide users towards more canonical usage. We may later decide whether to deprecate the alternatives.
Note also, that we have not used the alternatives in examples.