Rename AxisSliceInfo to SliceInfoElem #945
                
     Merged
            
            
          
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Closes #944.
I realized that the name
AxisSliceInfoisn't a great description for this type because it doesn't correspond to slicing information for a single input axis or a single output axis. This will be especially true if we add another variant for ellipsis-type functionality. The nameSliceInfoElemmore clearly describes the purpose of this type – to be an element in a list describing the slicing information.This PR also fixes a small error in the docs for the
s![]macro regarding the meaning of the step in slice;step. (See lines 693–694 ofslice.rs.)