Apply suggestions from code review

Author: WeiqunZhang

ExampleCodes/FFT/EnergySpectrum/main.cpp

@@ -23,7 +23,7 @@ int main (int argc, char* argv[])
         cMultiFab cx, cy, cz;
         {
             // Note that the complex Hermitian output array Y has (nx/2+1,ny,nz) elements.
-	    // Y[nx-i,j,k] = Y[i,j,k]*
+            // Y[nx-i,j,k] = Y[i,j,k]*
             FFT::R2C<Real,FFT::Direction::forward> fft(geom.Domain());
             auto const& [ba, dm] = fft.getSpectralDataLayout();
             cx.define(ba,dm,1,0);
@@ -57,10 +57,10 @@ int main (int argc, char* argv[])
                 Real value = amrex::norm(cxa[b](i,j,k))
                     +        amrex::norm(cya[b](i,j,k))
                     +        amrex::norm(cza[b](i,j,k));
-		// Account for Hermitian symmetry in x-direction
-	        // Hermitian symmetry Y[nx-i,j,k] = Y[i,j,k]*
+                // Account for Hermitian symmetry in x-direction
+                // Hermitian symmetry Y[nx-i,j,k] = Y[i,j,k]*
                 if ((i > 0) && (2*i != nx)) {
-		    // Multiply by 2 because we have +ki and -ki
+                    // Multiply by 2 because we have +ki and -ki
                     value *= Real(2.0);
                 }
                 HostDevice::Atomic::Add(pke+di, value);