fix(style): update namespaces.md to follow documentation style guide

[prathamesh04]

What this PR does

This PR fixes multiple documentation style violations in content/en/docs/tasks/administer-cluster/namespaces.md to align with the Kubernetes documentation style guide.

Changes made

• Replace 'we' with 'you' to address the reader directly as per style guide rules
• Remove informal language like 'let's' and 'simple'
• Replace 'cattle' metaphor with neutral terminology (related to issue docs: replace 'cattle vs. pets' metaphor with more precise terminology #54665)
• Fix grammar: change 'can not' to 'cannot', expand contractions for formal writing
• Improve clarity by rewriting sentences for better readability

Style guide violations fixed

Violation	Before	After
Using 'we' instead of 'you'	"we will create"	"you create"
Informal language	"let's spin up"	"create"
Cattle metaphor	"Production likes to run cattle"	"Create some pods in the production namespace"
Grammar	"can not"	"cannot"
Contractions	"There's"	"There is"

Verification

• No remaining 'we' usage in the file
• No remaining informal language
• Headings use sentence case
• All links are valid

Related issues

• Related to docs: replace 'cattle vs. pets' metaphor with more precise terminology #54665 (replace 'cattle vs pets' metaphor)
• Follows style guide: https://kubernetes.io/docs/contribute/style/style-guide/

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[lmktfy]

Thanks.

/lgtm

[lmktfy]

The original is more idiomatic.

[kubernetes-prow]

LGTM label has been added.

Details

Git tree hash: f905c2ccf139b83b4b66cdaad231fd21f937dc7a

[lmktfy]

Did you use AI help for this PR @prathamesh04 ?

If you did, you must say so.

[prathamesh04]

Hi! @lmktfy Yes, I used AI assistance (GitHub Copilot) for drafting the style edits. The changes were reviewed and verified by me against the Kubernetes style guide.