fixed typos

advanced/Scripts/piholeARPTable.sh

@@ -38,7 +38,7 @@ flushARP(){
 
     # Truncate network_addresses table in pihole-FTL.db
     # This needs to be done before we can truncate the network table due to
-    # foreign key contraints
+    # foreign key constraints
     if ! output=$(sqlite3 "${DBFILE}" "DELETE FROM network_addresses" 2>&1); then
         echo -e "${OVER}  ${CROSS} Failed to truncate network_addresses table"
         echo "  Database location: ${DBFILE}"