rfc-index.txt example is incorrect

[ajeanmahoney]

Describe the issue

The example at the top of https://www.rfc-editor.org/rfc-index.txt (which comes from ietf.templates.sync.rfc-index.txt) is incorrect because it shows a See Also (Also RFC1119) when the rfc-index itself does not show any See Alsos:

Current:

For example:

  1129 Internet Time Synchronization: The Network Time Protocol. D.L.
       Mills. October 1989. (Format: TXT, PS, PDF, HTML) (Also RFC1119)
       (Status: INFORMATIONAL) (DOI: 10.17487/RFC1129)

And the actual entry shows (no See Also):

1129 Internet Time Synchronization: The Network Time Protocol. D.L.
     Mills. October 1989. (Format: TXT, PS, PDF, HTML) (Status:
     INFORMATIONAL) (DOI: 10.17487/RFC1129)

Let's replace the example with a newer STD:

9915 Dynamic Host Configuration Protocol for IPv6 (DHCPv6). T. Mrugalski,
     B. Volz, M. Richardson, S. Jiang, T. Winters. January 2026. (Format:
     HTML, TXT, PDF, XML) (Obsoletes RFC8415) (Also STD102) (Status:
     INTERNET STANDARD) (DOI: 10.17487/RFC9915)

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