NN: Fixed doxygen warnings in GRU Example.
&middot; is complained to be unsupported, &sdot; seems to do the job.
* state.
* \par
* The computation can be summarized as:
- * <pre>z[t] = sigmoid( W_z &middot; {h[t-1],x[t]} )
- * r[t] = sigmoid( W_r &middot; {h[t-1],x[t]} )
- * n[t] = tanh( W_n &middot; [r[t] &times; {h[t-1], x[t]} )
+ * <pre>z[t] = sigmoid( W_z &sdot; {h[t-1],x[t]} )
+ * r[t] = sigmoid( W_r &sdot; {h[t-1],x[t]} )
+ * n[t] = tanh( W_n &sdot; [r[t] &times; {h[t-1], x[t]} )
* h[t] = (1 - z[t]) &times; h[t-1] + z[t] &times; n[t] </pre>
* \image html GRU.gif "Gate Recurrent Unit Diagram"
*
