Fix part, which do not match the current spec

[martenrichter]

trafficstars

Fixes wrong documentation

Changes proposed in this pull request:

Refer to the incomingBidirectionalStreams and its unidirectional counterpart instead of the older method, that is not present in current specs and implementation.

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src/site/content/en/blog/webtransport/index.md

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[chrome-devrel-review-bot]

Hello! This is an automated review by our custom reviewbot. It updates automatically when code or GitHub comments in this pull request are created or updated.

Requested changes

If there are any common problems with the content files you created or modified, they will be listed here.

src/site/content/en/blog/webtransport/index.md

• This file passed all of our automated Markdown audits.