doc: remove ed from apt-get package list

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/4672052

doc/install.html

@@ -91,7 +91,7 @@ installed as part of
 <a href="http://developer.apple.com/TOOLS/Xcode/">Xcode</a>. 
 </p>
 
-<p>On Ubuntu/Debian, use <code>sudo apt-get install bison ed gawk gcc libc6-dev
+<p>On Ubuntu/Debian, use <code>sudo apt-get install bison gawk gcc libc6-dev
 make</code>. If you want to build 32-bit binaries on a 64-bit system you'll
 also need the <code>libc6-dev-i386</code> package.
 </p>