docs(caldata): the EF data is no longer purely generated -- say so

Both ini headers described this data as generated from missalemeum, and the
generator described its own output as the file. Neither is true since the
eight corrections landed, and the gap is not cosmetic: missalemeum does not
carry any of them, so running scripts/gen-sanctoral-ef.go would silently
revert all four calendar fields, with nothing to notice it.

The two ini headers and the generator's own doc comment now each carry the
list of hand-corrected fields, the rubric behind each, and the warning that a
regeneration reverts them. Deliberately repeated in both places rather than
cross-referenced from one: either can rot, and repeating the list means the
other still shows it.

Also records what the six allow-listed oracle days actually mean now. The
oracle is not wrong to flag them -- missalemeum is simply the party that
disagrees with the Missal, which is a different situation from the one that
test was written for.

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