DOC: core/generic/drop docs from array-like to list-like
related #5248

cc @ruidc better? (I know its only 1 word.......)
 if it works, it works, but to me is not any clearer.
 still unclear

can you suggests doc/code change to make more clear?
 what about: 
"passing a string or tuple will be treated as a single index label" ?
 sure...
 I thought the confusing bit of the doc is that it's not clear that one can pass a single label. So why not this:

labels: scalar or list-like

Or whatever would be appropriate to designate a single label
 .... as indeed single integer labels are treated the same way, so it's not just tuples and strings that are treated this way - but I haven't delved beyond the commits today to understand _when_ this happens
 How about: single label or list-like?
 that's much clearer indeed!
 y
 pushed via 97f5878003116ea463545456858f049b38107a8f
