Change torchscript maintenance from note to warning

[msaroufim]

This changes the torchscript notes to warnings because we want people to move away from torchscript and not being under maintenance is scary

[pytorch-bot]

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[svekars]

Adding @gmagogsfm for approval

[malfet]

This change looks reasonable to me.

[theo-brown]

Sorry for asking this on a merged PR, but I couldn't tell where would be better.
Is there somewhere where:

• the decision to move torchscript to maintenance mode is documented/discussed?
• the future timeline of torchscript is outlined? (eg when it will become unmaintained)
• alternatives or migration pathways are signposted?

Thanks!