Fix (Improved readability of creating-sample-user.md) #10145

[Chirag-varu]

Changes several sentences for better grammar and flow

Clarified the purpose and steps for creating a ServiceAccount and ClusterRoleBinding

Improved formatting for commands and YAML blocks

Added context and links to official Kubernetes documentation

Fixed typo: "Sing in" → "Sign in"

Added warning note about HTTPS requirement for token login

Related Issue
Fixes #10145

🙌 Additional Notes
This enhancement ensures users—especially beginners—can easily follow the guide to set up a sample user and log in to the Kubernetes Dashboard using a bearer token, without confusion or ambiguity.

[linux-foundation-easycla]

• ✅login: Chirag-varu / (ea66ce3)

The committers listed above are authorized under a signed CLA.

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