small update to normalize explanation

src/core/heating_cooling_loads.jl

@@ -15,7 +15,7 @@
     monthly_mmbtu::Array{<:Real,1} = Real[],
     addressable_load_fraction::Any = 1.0,  # Fraction of input fuel load which is addressable by heating technologies. Can be a scalar or vector with length aligned with use of monthly_mmbtu or fuel_loads_mmbtu_per_hour.
     fuel_loads_mmbtu_per_hour::Array{<:Real,1} = Real[], # Vector of space heating fuel loads [mmbtu/hr]. Length must equal 8760 * `Settings.time_steps_per_hour`
-    normalize_and_scale_load_profile_input::Bool = false,  # Takes fuel_loads_mmbtu_per_hour and normalizes and scales it to annual or monthly energy
+    normalize_and_scale_load_profile_input::Bool = false,  # Takes fuel_loads_mmbtu_per_hour and normalizes and scales it to annual_mmbtu or monthly_mmbtu 
     existing_boiler_efficiency::Real = NaN
 ```