[Docs] fixes broken link

[MarvinGravert]

Hi,

i have noticed that the link to the schema which is referenced in contributing.md and devcontainerjson-reference.md is broken. It links to a devContainer.schema.src.json file that no longer exists in the vscode repo (removed in this PR).

I have adjusted the docs to link to the devContainer.base.schema.json which is found in this repo.

I hope this is correct. If not, sorry for any inconvenience.

[MarvinGravert]

@microsoft-github-policy-service agree

[bamurtaugh]

Thanks so much for opening this @MarvinGravert! I believe this should be updated to https://github.com/microsoft/vscode/blob/main/extensions/configuration-editing/schemas/devContainer.vscode.schema.json - would you be able to update your PR? Thanks!

[MarvinGravert]

Thanks for your feedback @bamurtaugh ! I have changed the link to your recommendation.

[bamurtaugh]

Thanks again!

[Adityarujid30]

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[samruddhikhandale]

Thank you!