docs: Clarify that [initial_user](http://_vscodecontentref_/3) is not required in Cluster #32253
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The comment for the initial_user field in the Cluster message has been updated to remove the "Required." annotation, better reflecting its optional nature.
PiperOrigin-RevId: 841859434
Source-Link: googleapis/googleapis@35365cb
Source-Link: https://github.com/googleapis/googleapis-gen/commit/18ed7a97dd69cb781ea06610673b1778f99ee175
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