hdf5doc

Description:
    H5Fcreate and H5Fopen:
    Clarified behavior and interaction of flags.
    Did not add further documentation of H5F_ACC_DEBUG as that 
        flag is scheduled to be removed from the library.
      -- Fixes Bugzilla entry 1451
    Other editorial and HTML updates.

    H5Fcreate only:  
    Added text explaining that H5F_ACC_RDWR and 
        H5F_ACC_RDONLY are not relevant in the case of H5Fcreate.
      -- Fixes Bugzilla entry 1500.
Tested:  Firefox