docs: improve clarity of creating-sample-user.md documentation

[Sayeem3051]

…ove clarity of creating-sample-user.md documentationdocs: improve clarity of creating-sample-user.md documentationUpdate creating-sample-user.md

Improve documentation clarity in the long-lived Bearer Token section as requested in issue #10145.

Changes made:

• Enhanced explanation of when to use long-lived vs short-lived tokens
• Added security considerations and best practices
• Restructured the long-lived token section with clear step-by-step instructions
• Added better explanations for token lifecycle and validity
• Improved formatting and readability throughout the document
• Added cleanup instructions for long-lived tokens

Fixes #10145

[linux-foundation-easycla]

• ✅login: Sayeem3051 / name: Abkari Mohammed Sayeem / (67a83b9)

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