doc/go1.2.html: delete repeated word

TBR=rsc

R=golang-dev
CC=golang-dev
https://golang.org/cl/19840043

doc/go1.2.html

@@ -182,7 +182,7 @@ Before Go 1.2, it was too easy for a runaway recursion to consume all the memory
 <p>
 <em>Updating</em>:
 The increased minimum stack size may cause programs with many goroutines to use
-more memory. There is no workaround, but future plans for future releases
+more memory. There is no workaround, but plans for future releases
 include new stack management technology that should address the problem better.
 </p>