Fix Developer Platform link in OAuth2 in Datadog doc

[holdenmc]

What does this PR do? What is the motivation?

Updates the "Developer Platform" link in the "Implement the OAuth protocol" section from https://app.datadoghq.com/apps to https://app.datadoghq.com/publishing-platform.

Note: There is a second occurrence of https://app.datadoghq.com/apps on this page — it appears as the anchor text for "SHA-256" in the Code Challenge Method table of the "Use the PKCE extension" section. That link appears to be a dead end / incorrect target, but I'm not sure what it should point to instead. Leaving it for a follow-up.

Merge instructions

Merge readiness:

• Ready for merge

Additional notes

[github-actions]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/holden/fix-oauth2-publishing-platform-link/extend/authorization/oauth2_in_datadog

[evazorro]

Note: There is a second occurrence of https://app.datadoghq.com/apps on this page — it appears as the anchor text for "SHA-256" in the Code Challenge Method table of the "Use the PKCE extension" section. That link appears to be a dead end / incorrect target, but I'm not sure what it should point to instead. Leaving it for a follow-up.

@holdenmc yeah, it looks like that link was introduced when the doc was first created, but I agree that is probably not what it should point to. I'm just going to remove the link, because SHA-256 is an easy enough thing to google; I don't think we need to link to an article about it or anything.

[holdenmc]

@evazorro agreed, that makes sense!

[evazorro]

Thank you for fixing this!