Changed "square" to "curly" (#2373)
Changed "square" to "curly" (#2373)

It says:
An object is enclosed by **square** brackets `{`, `}`,
But they are not square`[`,`]`, they are **curly** `{`, `}`.
The proposal is:
An object is enclosed by curly brackets `{`, `}`,
FSMaxB/mathjs,josdejong/mathjs,FSMaxB/mathjs,FSMaxB/mathjs,josdejong/mathjs,FSMaxB/mathjs,josdejong/mathjs,josdejong/mathjs,FSMaxB/mathjs,josdejong/mathjs