De-Coreify /doc/tor.md
De-Coreify /doc/tor.md

Summary:
Change Core to ABC in /doc/tor.md

Part of task T59

Test Plan: N/A

Reviewers: deadalnix, freetrader, O1 Bitcoin ABC, #bitcoin_abc

Reviewed By: deadalnix, O1 Bitcoin ABC, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D314

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