doc: remove linking of url text to url · nodejs/node@b8213f1

Original file line number	Diff line number	Diff line change
`@@ -206,7 +206,7 @@ needs to be pointed out separately during the onboarding.`
`206`	`206`	`## Exercise: Make a PR adding yourself to the README`
`207`	`207`
`208`	`208`	`* Example:`
`209`		`-[https://github.com/nodejs/node/commit/ce986de829457c39257cd205067602e765768fb0][]`
	`209`	`+https://github.com/nodejs/node/commit/ce986de829457c39257cd205067602e765768fb0`
`210`	`210`	* For raw commit message: `git log ce986de829457c39257cd205067602e765768fb0
`211`	`211`	-1`
`212`	`212`	`* Collaborators are in alphabetical order by GitHub username.`
`@@ -250,7 +250,6 @@ needs to be pointed out separately during the onboarding.`
`250`	`250`	[`git-node`]: https://github.com/nodejs/node-core-utils/blob/master/docs/git-node.md
`251`	`251`	[`node-core-utils`]: https://github.com/nodejs/node-core-utils
`252`	`252`	`[Landing Pull Requests]: https://github.com/nodejs/node/blob/master/COLLABORATOR_GUIDE.md#landing-pull-requests`
`253`		`-[https://github.com/nodejs/node/commit/ce986de829457c39257cd205067602e765768fb0]: https://github.com/nodejs/node/commit/ce986de829457c39257cd205067602e765768fb0`
`254`	`253`	`[Publicizing or hiding organization membership]: https://help.github.com/articles/publicizing-or-hiding-organization-membership/`
`255`	`254`	`[set up the credentials]: https://github.com/nodejs/node-core-utils#setting-up-credentials`
`256`	`255`	`[two-factor authentication]: https://help.github.com/articles/securing-your-account-with-two-factor-authentication-2fa/`