2015: fix a typo in Go Dynamic Tools slides

Change-Id: Ia59989a4bab1b2b2290cde43200afd39d79ff521
Reviewed-on: https://go-review.googlesource.com/12264
Reviewed-by: Andrew Gerrand <adg@golang.org>
diff --git a/2015/dynamic-tools.slide b/2015/dynamic-tools.slide
index c50ce7f..30ab740 100644
--- a/2015/dynamic-tools.slide
+++ b/2015/dynamic-tools.slide
@@ -150,7 +150,7 @@
 
 * Randomized testing
 
-A different appraoch to testing that finds [lots of] bugs that other testing approaches do not. Intended mostly for programs that parse complex inputs.
+A different approach to testing that finds [lots of] bugs that other testing approaches do not. Intended mostly for programs that parse complex inputs.
 
 Generate random blob -> feed into program -> see if it crashes -> profit!