adding FLUID_MIXTURE and MARKER_INLET_TURBULENT descriptions

Author: Cristopher-Morales

_docs_v7/Markers-and-BC.md

@@ -129,14 +129,19 @@ MARKER_FAR= (farfield)
 | --- | --- |
 | `RANS`, `INC_RANS`, | 7.3.0 |
 
-The turbulence boundary conditions do not have a `MARKER_` keyword but can instead be set for inlet and freestream boundaries using the keywords: 
+The turbulence boundary conditions do not have a `MARKER_` keyword for the SA Turbulence model but can instead be set for inlet and freestream boundaries using the keyword: 
 
-For the SA turbulence model:
 ```
 FREESTREAM_NU_FACTOR= 3
 ```
 
-For the SST turbulence model:
+Conversely, For the SST turbulence model, it is possible to provide a 'MARKER_INLET' where turbulence intensity and turbulent-to-laminar ratio can be provided at each inlet as follow:
+
+```
+MARKER_INLET_TURBULENT= (inlet_1, TURBULENCEINTENSITY_1, TURB2LAMVISCRATIO_1 , inlet_2, TURBULENCEINTENSITY_1, TURB2LAMVISCRATIO_1 ,..)
+```
+If 'MARKER_INLET_TURBULENT' are not provided in the .cfg file, SU2 will filled up the markers with the freestream options:
+
 ```
 FREESTREAM_TURBULENCEINTENSITY= 0.05
 FREESTREAM_TURB2LAMVISCRATIO= 10

_docs_v7/Solver-Setup.md

@@ -58,6 +58,7 @@ For fluid simulations, a model defining the equation of state and thermodynamic
 |`CONSTANT_DENSITY` | **Constant density** |
 |`INC_IDEAL_GAS` | **Incompressible ideal gas** |
 |`INC_IDEAL_GAS_POLY` | **Incompressible ideal gas** |
+|`FLUID_MIXTURE` | **Incompressible ideal gas mixing laws for multicomponent flow** |
 |`SU2_NONEQ` | **SU2 nonequilibrium thermochemical library** |
 |`MUTATIONPP` | **Mutation++ nonequilibrium thermochemical library** |
 

_tutorials/incompressible_flow/Inc_Species_Transport_Composition_Dependent_Model/Inc_Species_Transport_Composition_Dependent_Model.md

@@ -241,5 +241,3 @@ $^{4}$ T. A. Davidson, A simple and accurate method for calculating viscosity of
 
 
 ## Additional remarks
-
-An in depth optimization of this case with addition of the FFD-box, gradient validation and some more steps can found [here](/tutorials/Species_Transport/).