doc/install: we don't print 'The compiler is 6g' anymore

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/6273050

doc/install-source.html

@@ -170,7 +170,6 @@ ALL TESTS PASSED
 Installed Go for linux/amd64 in /home/you/go.
 Installed commands in /home/you/go/bin.
 *** You need to add /home/you/go/bin to your $PATH. ***
-The compiler is 6g.
 </pre>
 
 <p>