[docs] [issue26017] Update https://docs.python.org/3/installing/index.html to always quote arguments

[Ezio Melotti]

Ezio Melotti added the comment:

I think it's enough to add a note that says that if the argument contains > (and possibly other) special characters, then it needs to be quoted.
Examples that use > should also be quoted, but not the others one.

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nosy: +ezio.melotti

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<http://bugs.python.org/issue26017>
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