ABS documentation wrong

[warpster]

The documentation says that ABS returns

x: if x is greater than or equal to 0.
or
-x: if x is less than 0. <-----this is wrong I believe, should be x: if x is less than 0. (no minus)

That is unless ABS works different in Arduino than any other language.

[per1234]

Duplicate of #3338

[facchinm]

Closing as duplicate