Example files fixed

examples/methane_mixtures.md

@@ -44,7 +44,7 @@ Equilibrium calculation for methane CO2 mixtures:
 
 
 ```python
-el = gp.fluid({'CH4': 1}, fs) + ratio * gp.fluid({'H2O': 1}, fs)
+el = gp.fluid({'CH4': 1}, fs) + ratio * gp.fluid({'CO2': 1}, fs)
 equilibrium_co2 = gp.equilibrium(el, t, p)
 ```
 

examples/thermodynamic_carbon_activity.md

@@ -58,7 +58,7 @@ Plot carbon activities, a activity of > 1 means there is thermodynamically the f
 
 ```python
 fig, ax = plt.subplots(figsize=(6, 4), dpi=120)
-ax.set_xlabel("CO2/CH4")
+ax.set_xlabel("H2O/CH4")
 ax.set_ylabel("carbon activity")
 ax.set_ylim(1e-1, 1e3)
 ax.set_yscale('log')