Update kubernetes.md - Fixed minor typo

[Misterjohnson87]

Purpose of this pull request

This pull request corrected 'Event bub' to 'Event hub'

Select the type of change

• Minor Changes - Typos, formatting, slight revisions
• Update Content - Revisions, updating sections
• New Content - New features, sections, pages, tutorials
• Site and Tools - .clabot, version updates, maintenance, dependencies, new packages for the site (Docusaurus, Gatsby, React, etc.)

Ticket (if applicable)

N/A

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