Show [[ <conditional> ]] instead of [ <conditional> ]

[Leandros]

In the table where conditionals are explained, [ <condional> ] is shown, but on the top [[ <conditional> ]] is favored.
Stick to [[ <conditional> ]], both are valid, but single brackets behave very differently to double brackets.

Double brackets are a bash feature, and not required by POSIX, while single brackets are required by the POSIX standard.

[Leandros]

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