docs: clarify chunked behavior in non-blocking pod log example

[nagashiva23]

Summary

Clarify the behavior of pod log streaming when _preload_content=False is used.

The non-blocking log streaming example now explains that streamed data is returned in transport-level chunks, which may contain multiple or partial log lines. Applications that require line-oriented processing should buffer and split on newline boundaries.

Motivation

This change improves the example by documenting behavior that can surprise users when streaming logs with _preload_content=False, as discussed in Issue #2426.

Changes

• Added explanatory comments to examples/pod_logs_non_blocking.py
• No runtime behavior changed

[linux-foundation-easycla]

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[roycaihw]

/lgtm
/approve
/release-note-none

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This pull-request has been approved by: nagashiva23, roycaihw

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