/usr/share/zsh/help/umask is in zsh-common 5.1.1-1ubuntu2.3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | umask [ -S ] [ mask ]
The umask is set to mask. mask can be either an octal number or
a symbolic value as described in chmod(1). If mask is omitted,
the current value is printed. The -S option causes the mask to
be printed as a symbolic value. Otherwise, the mask is printed
as an octal number. Note that in the symbolic form the permis-
sions you specify are those which are to be allowed (not denied)
to the users specified.
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