CONTRIBUTING.md: fix PuTTY URL #5725
Merged
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Already in c2a2fd5 (CONTRIBUTING.md: add guide for first-time contributors, 2018-03-01) there were two links added for PuTTY, one being the correct, official one, and the other an official-looking one owned by a third-party. Let's only use the official one.
Original-patch-by: @jsoref in microsoft#774