minor typo fixes
diff --git a/src/part2/docs/tutorial-part1.ppt b/src/part2/docs/tutorial-part1.ppt
index fe12edb..d394b2b 100644
--- a/src/part2/docs/tutorial-part1.ppt
+++ b/src/part2/docs/tutorial-part1.ppt
Binary files differ
diff --git a/src/part2/docs/tutorial-part2.ppt b/src/part2/docs/tutorial-part2.ppt
index 9c8e16c..8c16aab 100644
--- a/src/part2/docs/tutorial-part2.ppt
+++ b/src/part2/docs/tutorial-part2.ppt
Binary files differ