minor updates to heat transfer bc explanation

Author: TobiKattmann

_docs_v7/Markers-and-BC.md

@@ -10,7 +10,7 @@ The term *Marker* refers to a named entity in your mesh file. Boundary condition
 - [Euler (Slip) Wall](#euler-slip-wall)
 - [Symmetry Wall](#symmetry-wall)
 - [Constant Heatflux (no-slip) Wall](#constant-heatflux-no-slip-wall)
-- [Heat Transfer / Convection (no-slip) Wall](#heattransfer-no-slip-wall)
+- [Heat Transfer or Convection (no-slip) Wall](#heat-transfer-or-convection-no-slip-wall)
 - [Isothermal (no-slip) Wall](#isothermal-no-slip-wall)
 - [Farfield Boundary Condition](#farfield-boundary-condition)
 - [Inlet Boundary Condition](#inlet-boundary-condition)
@@ -75,14 +75,14 @@ MARKER_HEATFLUX = (Wall1, 1e05, Wall2, 0.0)
 
 **Note**: Typically Navier-Stokes and RANS simulations are setup with adiabatic walls (heatflux = 0).
 
-## Heat Transfer / Convection (no-slip) Wall ##
+## Heat Transfer or Convection (no-slip) Wall ##
 
 | Solver | Version | 
 | --- | --- |
 | `NAVIER_STOKES`, `RANS`, `INC_NAVIER_STOKES`, `INC_RANS` | 7.0.0 |
 
 
-A wall with a prescribed locally variable heatflux via a heat transfer coefficient and and a Temperature at infinity (or reservoir Temperature) is defined with the `MARKER_HEATTRANSFER` option. The heatflux `q` computes to `q = h(T_inf - T_wall)`. The option format is the marker name followed by the value of the heat-transfer coefficient (in Watts per square meter and Kelvin `[W/(m^2*K)],[J/(s*m^2*K)]`) and the value of the Temperature at infinity (in Kelvin `[K]`), e.g.
+A wall with a prescribed locally variable heatflux via a heat transfer coefficient and and a Temperature at infinity (or reservoir Temperature) is defined with the `MARKER_HEATTRANSFER` option. The heatflux `q` computes to `q = h(T_inf - T_wall)`, where `T_wall` is the local wall temperature and therefore no user input. The option format is the marker name followed by the value of the heat-transfer coefficient (in Watts per square meter and Kelvin `[W/(m^2*K)],[J/(s*m^2*K)]`) and the value of the Temperature at infinity (in Kelvin `[K]`), e.g.
 ```
 MARKER_HEATTRANSFER = (Wall1, 10.0, 350.0, Wall2, 5.0, 330.0, ...)
 ```