Removed some C++-style comments from H5FDcore.c.

Tested on:
    32-bit LE linux (jam) 

Tested with HDF5_DRIVER set to "core_paged".



git-svn-id: https://svn.hdfgroup.uiuc.edu/hdf5/trunk@25161 dab4d1a6-ed17-0410-a064-d1ae371a2980