Pigeonhole page's RFC links broken (fix attached)

[Patrick Nagel]

Hi there,

I was just reading https://pigeonhole.dovecot.org/ and noticed that all the 
links to the RFCs are broken. I fixed them via regexp search & replace

curl https://pigeonhole.dovecot.org/ | sed -e 's|https\?://tools.ietf.org/html/rfc\([0-9]\{4\}\)/\?|https://www.ietf.org/rfc/rfc\1.html|g' >Pigeonhole_fixed_rfc_links.html

and attached the resulting page.

Cheers,
Patrick.
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