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docs: omnibus cleanup
Includes harmonizing the display of options and arguments, standardising terminology, using the envvar directive more broadly, adding help options to all commands that support them, simplifying some language, and tidying up multiple formatting issues. string documentation is not changed.
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@@ -19,6 +19,7 @@ Description
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If the specified file descriptor is a terminal device, the exit status of the command is zero. Otherwise, the exit status is non-zero. No messages are printed to standard error.
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The **-h** or **--help** option displays help about using this command.
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Examples
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--------
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