docs: add note about lambda versioning best practice (#4503)

* docs: add note about lambda versioning best practice

* fix: move admonition closing ::: to its own line

The linter merged the ::: closing tag onto the preceding text line,
which breaks MDX admonition rendering.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: lennessyy