Change natural number to non-negative integer (#7161)

* natural → whole

* positive whole

* positive whole number → non-negative integer
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Aadi Bajpai 2020-06-29 23:56:53 +05:30 committed by GitHub
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@ -397,7 +397,7 @@ To write them on the same line, use the semicolon (";"). That means the followin
Exit Status
-----------
When a command exits, it returns a status code as a natural number.
When a command exits, it returns a status code as a non-negative integer.
Unlike other shells, ``fish`` stores the exit status of the last command in ``$status`` instead of ``$?``.