go.talks: Fix a typo and increase size of array to get heap error.

Right now we get a [process took too long] error, which doesn't prove the point.

LGTM=adg
R=adg, fresh.grass.yum
CC=golang-codereviews
https://golang.org/cl/117190043
diff --git a/2014/playground.slide b/2014/playground.slide
index 610e0ad..fe13fc2 100644
--- a/2014/playground.slide
+++ b/2014/playground.slide
@@ -208,7 +208,7 @@
 ## TIME ##
 ##########
 
-* Sleeping int the playground
+* Sleeping in the playground
 
 Go is about concurrency.
 
diff --git a/2014/playground/heap.go b/2014/playground/heap.go
index bd83db1..dc0f777 100644
--- a/2014/playground/heap.go
+++ b/2014/playground/heap.go
@@ -1,7 +1,7 @@
 package main
 
 type list struct {
-	buf  [1000]byte
+	buf  [100000]byte
 	next *list
 }