encodedKey indexing out of sync in docs/CaskSecret.md

[KalleOlaviNiemitalo]

In https://github.com/microsoft/cask/blob/main/docs/CaskSecret.md#url-safe-base64-encoded-rendering-example-for-256-bit-key-no-optional-data, the indexing of encodedKey goes out of sync after <12-bits-reserved> "AA":

cask/docs/CaskSecret.md

Lines 84 to 91 in 6f4c272

	|encodedKey[52..56]|'TEST'| Provider fixed signature.
	|encodedKey[56..58] | 'AA' | Reserved encoded zero characters.
	|encodedKey[59]|'A'...'_'| Time-of-allocation year, 'A' (2025) to '_' (2088)|
	|encodedKey[60|'A'...'L'| Time-of-allocation month, 'A' (January) to 'L' (December)|
	|encodedKey[61]|'A'...'Z'\|'a'..'e'| Time-of-allocation day, 'A' (0) to 'e' (31)|
	|encodedKey[62]|'A'...'X'| Time-of-allocation hour, 'A' (hour 0 or midnight) to 'X' (hour 23).
	|encodedKey[63]|'A'...'7'| Time-of-allocation minute, 'A' (0) to '7' (59).
	|encodedKey[64]|'A'...'7'| Time-of-allocation second, 'A' (0) to '7' (59).

It shows the time-of-allocation second at encodedKey[64], but that should instead be at encodedKey[63] so that the size of the whole thing is 64 characters and it evenly translates to 64/4*3 = 48 bytes.

Also, there is a closing bracket missing, and the 'a'..'e' range should use ... rather than .. because it's meant to include 'e'.

The table should end like this:

String Range	Text Value	Description
…	…	…
encodedKey[52..56]	'TEST'	Provider fixed signature.
encodedKey[56..58]	'AA'	Reserved encoded zero characters.
encodedKey[58]	'A'...'_'	Time-of-allocation year, 'A' (2025) to '_' (2088)
encodedKey[59]	'A'...'L'	Time-of-allocation month, 'A' (January) to 'L' (December)
encodedKey[60]	'A'...'Z'|'a'...'e'	Time-of-allocation day, 'A' (0) to 'e' (31)
encodedKey[61]	'A'...'X'	Time-of-allocation hour, 'A' (hour 0 or midnight) to 'X' (hour 23).
encodedKey[62]	'A'...'7'	Time-of-allocation minute, 'A' (0) to '7' (59).
encodedKey[63]	'A'...'7'	Time-of-allocation second, 'A' (0) to '7' (59).