Update service-bus-partitioning.md

[DennisHeldens]

The 1 MB message size limit for partitioned premium namespaces is not in effect anymore. The size limit is currently the same as for not partitioned namespaces.

[prmerger-automator]

@DennisHeldens : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[prmerger-automator]

@DennisHeldens : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[learn-build-service-prod]

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[spelluru]

@EldertGrootenboer - Could you please review the PR when you get a chance? Thanks.

#reassign: @EldertGrootenboer

[v-regandowner]

@EldertGrootenboer

Can you review the proposed changes?

Due to the upcoming BUILD conference, all merging and publishing is on hold until the morning of May 19th.

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team