[v1.16] docs: Add note for CNP empty slices semantic under v1.16 section #34008
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The semantic change for empty non-nil slice in CNPs targeted v1.16, but the related release note was inadvertently appended under the "v1.15 Upgrade Notes" section (see PR #29608). Therefore, that note was deleted when preparing the documentation for v1.16 in #33703
The PR adds back the upgrade note in the v1.16 section where it belongs.
Related: e47e295 ("docs: cleanup upgrade docs on 1.16")
Related: 966757d ("docs: add upgrade note for dangling cidrGroupRefs")
Fixes: 5f77d50 ("docs: Add upgrade note for CNP empty slices new semantic")