[PROJ] Documentation typo (minor)

[Martin Desruisseaux]

C++ API documentation for SingleCRS.coordinateSystem() [1] contains 
/"This might be null, in which case datumEnsemble() return will not be 
null"/. I think this is an accidental copy-and-paste from the 
SingleCRS.datum() documentation and that this sentence (together with 
/"that might be null"/ in the return description) should be removed in 
the coordinateSystem() case.

[1] https://proj.org/development/reference/cpp/crs.html#_CPPv4N5osgeo4proj3crs9SingleCRS16coordinateSystemEv

     Martin


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