Clarify repository reference in documentation

[nastylex]

Included humour in text (repo) towards the end .

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Source	Review	Production	What Changed
rest/guides/index.md	fpt ghec ghes@ 3.223.213.203.193.183.17	fpt ghec ghes@ 3.223.213.203.193.183.17

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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[subatoi]

@nastylex Thanks for your interest in the GitHub docs, but I'm going to close this one out.