[typo] Fix disagreement between value, character, and name

[nicktimko]

Used to be the hex value and description agreed, and the character was odd-one-out, but now the hex value is the odd-one after 77df9a1.

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[fbidu]

It checks out. Nice catch, never would've noticed...

[nicktimko]

@sir-sigurd spotted it, I just did a quick PR.

import unicodedata
for n in range(0x2167, 0x2169):
    print(hex(n), chr(n), unicodedata.name(chr(n)))

# output:
# 0x2167 Ⅷ ROMAN NUMERAL EIGHT
# 0x2168 Ⅸ ROMAN NUMERAL NINE

[corona10]

I think that @ethanfurman can review this PR well.

[nicktimko]

Go with #15541, looks more complete.