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docs(validations): document how each rule treats a special missing value #8

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hermes wants to merge 4 commits from docs/special-missing-rule-behaviour into main
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docs/dcc-validations.md
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@@ -49,6 +49,8 @@ Check back frequently as we keep growing this list of checks. For how each rule
A SAS numeric variable has 28 missing values: the regular `.` and 27 special ones (`.A`-`.Z` and `._`). Data Controller accepts them in a numeric cell as a bare letter - `a` to `z`, or `_`, with no period - and stores the matching special missing in SAS.
A numeric column that carries a date, datetime or time format is the exception. Those cells are edited through a date picker rather than the numeric editor, and the picker accepts only a date - so a special missing cannot be typed into one of them.
The rules treat a special missing as a value for some checks and as a missing value for others:
|Rule|What happens to a special missing|