cpp: bioformats: Work around doxygen doc warnings

Some inline template methods are marked as undocumented even when the
prototype is fully documented.  And this is not even consistent for
all the methods of this type.  This just removes warnings for some
doxygen versions.
cpp: xerces: Minor whitespace fix in EntityResolver
Merge pull request #1473 from rleigh-dundee/cpp-array-docfix

C++: Minor documentation and whitespace fixes