Patch few mistake in the presentation

index.Rmd

@@ -451,12 +451,12 @@ kable(data.frame(`Shanon index`=H),
 <div style="float: left; width: 50%;">
 As :
 $$
-H(X) = \log|A| \;\Rightarrow\; ^2D = e^{H(X)}
+H(X) = \log|A| \;\Rightarrow\; ^1D = e^{H(X)}
 $$
 <br>
 </div>
 <div style="float: right; width: 50%;">
-where $^2D$ is the theoretical number of species in a evenly distributed community that would have the same Shanon's entropy than ours.
+where $^1D$ is the theoretical number of species in a evenly distributed community that would have the same Shanon's entropy than ours.
 </div>
 
 <center>