Fix grammar and clarity issues in Node architecture documentation

[NA-V10]

Description

This PR fixes several minor grammar, punctuation, and clarity issues in the Nodes documentation. The updates improve readability while preserving the original intent.

Updates include:

• Added missing articles such as “the”, “a”, and “an”
• Corrected incorrect colon usage in a sentence
• Improved sentence flow for clarity and consistency
• Fixed minor awkward phrasing
• Removed a trailing space before a line break

These improvements enhance the accuracy and readability of the page for Kubernetes learners.

Issue

No linked issue — this is a standalone documentation improvement.

Closes: #

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: NA-V10 / name: NA-V10 (1bb5853)

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[Arhell]

lgtm

[stmcginnis]

Thanks, looks great! If there are any other things that can be improved in this file while you're at it, that would be great to include. But this is an improvement.

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: d8ff62942b17b69695cf5eb1591d3a54225aa3ae

[lmktfy]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lmktfy

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