Docs: Clarify the use of --reconcile-timeout in getting-started guide

[aravindtga]

Description

• What changed: Updated the getting-started guide to explain why --reconcile-timeout=15m is used in kpt live apply examples.
• Why it's needed: The previous text did not explain the timeout aspect or what happens without the flag, which was reported in Clarify the use of --reconcile-timeout in kpt live apply #1865.
• How it works: Replaced the brief one-liner with an explanation that clarifies what the flag does, what happens without it (waits indefinitely), and why setting a timeout is recommended.

Related Issue(s)

• Fixes Clarify the use of --reconcile-timeout in kpt live apply #1865

Type of Change

• Documentation

Checklist

• Code follows project style guidelines
• Self-reviewed changes
• Tests added/updated
• Documentation added/updated
• All tests and gating checks pass

AI Disclosure

• I have used AI in the creation of this PR.

If so, please describe how:
- Kiro to investigate the issue, compare --reconcile-timeout behaviour with other tools (kubectl, Helm), draft the documentation fix and draft PR message.

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