Minor issue in comments in Alloc_obs

This is a very minor issue on the code of the Subroutine Alloc_Obs found in many Hamiltonian modules

In the part of the code that allocates time-displaced observables, sometimes it is commented "equal-time correlators". For example, in Hamiltonians_Hubbard_smod.F90 here

             If (Ltau == 1) then
                ! Equal time correlators
                Allocate ( Obs_tau(5) )
                Do I = 1,Size(Obs_tau,1)
                   select case (I)
                   case (1)
                      Channel = 'P' ; Filename = "Green"
             ....

the comment is misleading and should read

             If (Ltau == 1) then
                ! Time-displaced correlators
                Allocate ( Obs_tau(5) )
                Do I = 1,Size(Obs_tau,1)
                   select case (I)
                   case (1)
                      Channel = 'P' ; Filename = "Green"

             ....