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Properly cite RFC 1918 Section 3 for ipv4,
and RFC 4193 Section 8 for ipv6 comments.

Updates #29146

Change-Id: I8a2df0d7bef50444294bb3301fe09fb09f21ffaf
GitHub-Last-Rev: b034179
GitHub-Pull-Request: #45500
Reviewed-by: Emmanuel Odeke <>
Reviewed-by: Tobias Klauser <>
Run-TryBot: Emmanuel Odeke <>


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