doc: fix GitHub PR link in getting-started.md

[ghost]

The 'Getting Started' documentation page has a section about replacing the GitHub PR URL with reviewstack, but the link in Markdown is parsed as GitHub flavored Markdown and shows just facebook/react#25506 instead of https://github.com/facebook/react/pull/25506 which is slightly confusing. This change fixes that to the full intended URL is displayed.

See: https://sapling-scm.com/docs/introduction/getting-started#browsing-pull-requests

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[quark-zju]

Thanks! I removed the code span so they render as regular text.

[ghost]

In my first commit I didn't wrap them in a code span but they still appeared to render as org/project#1 instead of github.com/org/project/pull/1 (at least in the GitHub diff for the rendered Markdown). Since Docusaurus uses GitHub flavored Markdown I suspect it would be the same without the code span.

[quark-zju]

they still appeared to render as org/project#1 instead of github.com/org/project/pull/1

I noticed that. I found appending a space also works so I used that instead.

[quark-zju]

I think this was pushed as fe03a17. Not sure why the bot didn't close this...

[ghost]

Ah cool. Thank you @quark-zju!