docs(L3): the bissextile rubric is scan-verified after all

L3 recorded that the leap-year shift rested on the LT.txt transcription
alone, the scans having been searched without result. It is in scan2.txt
at 3050-3058, OCR-damaged but unmistakable.

The earlier search missed it for a findable reason, now written into the
entry: the OCR mangles the saint and the keyword alike -- "Matthue",
"Cabrielis", "bi&sextili" -- so neither "Matth" nor "bissext" matches. It
turns up on the undamaged phrase "februarius est dierum".

Transcription and scan now agree, which makes this two witnesses of one
document rather than one. Still one document; the citation continues to say
calendarium rather than RG, because a calendarium footnote is what it is.

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