"~~" and "~" case-toggling modification undocumented

[Andreas Kusalananda Kähäri]

When the ",", ",,", "^", and "^^" case-modifying operators were
introduced with Bash 4.0 some 13 years ago, the operators "~" and "~~"
were also introduced.  These toggle the case of the first character that
match the pattern ("~") or the all characters that match the pattern
("~~") in a similar manner as up-casing and down-casing is done with "^"
and ",".

However, as far as I can see, the case-toggling operators remain
undocumented.

I wonder if this is on purpose due to some instability or other
deficiency in the code, or whether it's an oversight (hence this bug
report).


-- 
Andreas (Kusalananda) Kähäri
SciLifeLab, NBIS, ICM
Uppsala University, Sweden

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