doc: Improve docstrings for isobject, ismethod, isprop. * ov-class.cc (Fisobject): Add seealso link to isprop. * ov-class.cc (Fismethod): Use 'obj' as the input variable name, rather than just 'x'. * isprop.m: Use 'obj' as the input variable name, rather than just 'h'. Add note that 'obj' may be a class object or a handle to a graphics object.

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