fix typos

Advanced/Random Walks/parts/1 circuits.tex

@@ -92,7 +92,7 @@ which must hold at every node \textbf{except the source and ground vertices.} \p
 	\vspace{2mm}
 
 	It may be a good idea to give the class a quick lecture on this topic,
-	explaining the basics of electonic circuits and circuit diagrams.
+	explaining the basics of electronic circuits and circuit diagrams.
 
 	\vspace{2mm}