Docs/spark operator fix

[aniketpati1121]

Fixed grammar in Spark Operator documentation: changed "life cycle of Spark applications are managed" to "life cycle of Spark applications is managed".

fixes #4193

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[aniketpati1121]

Hi @kubeflow/owners, I've fixed the grammar in the Spark Operator documentation:

"life cycle of Spark applications are managed" → "life cycle of Spark applications is managed"

Could you please review and approve the PR? The failing Netlify deploy checks are unrelated to this minor documentation change. Thanks!

[Arhell]

/ok-to-test

[aniketpati1121]

Hi,
This is a small grammar fix in Spark Operator docs.
@terrytangyuan @yuchaoran2011 could you please take a look and approve when you get a chance?
The failing Netlify checks are unrelated to this change. Thanks!

[terrytangyuan]

cc @kubeflow/wg-data-leads

[tarilabs]

from

are vastly different

to

is vastly different

newline,

are good changes to me.

The /themes/docsy bump does not seem related to the PR goal.