fix definition of Hamming distance

(looks like it was an accidental copy & paste of the Jaccard distance)

embeddings.tex

@@ -1348,7 +1348,7 @@ \subsubsection{TF-IDF}
   \item Euclidean distance - calculates the straight-line distance between two points
   \item Manhattan Distance - Measures the distance between two points by summing the absolute differences of their coordinates
   \item Jaccard Distance - Computes the dissimilarity between two sets by dividing the size of their intersection by the size of their union.
-  \item Hamming Distance  - Measures the dissimilarity between two sets by dividing the size of their intersection by the size of their union
+  \item Hamming Distance  - Measures the dissimilarity between two strings by counting the positions in which they differ
 \end{itemize}
 \end{formal}