Patch few mistake in the presentation

index.html

@@ -1751,11 +1751,11 @@ Environment.2
 
 <div style="float: left; width: 50%;">
 <p>As : \[
-H(X) = \log|A| \;\Rightarrow\; ^2D = e^{H(X)}
+H(X) = \log|A| \;\Rightarrow\; ^1D = e^{H(X)}
 \] <br></p></div>
 
 <div style="float: right; width: 50%;">
-<p>where \(^2D\) is the theoretical number of species in a evenly distributed community that would have the same Shanon&#39;s entropy than ours.</p></div>
+<p>where \(^1D\) is the theoretical number of species in a evenly distributed community that would have the same Shanon&#39;s entropy than ours.</p></div>
 
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