doc/go1.1: remove discussion of "go run" change

Update #5164

R=golang-dev, dave
CC=golang-dev
https://golang.org/cl/9049043

doc/go1.1.html

@@ -398,16 +398,6 @@ To update pre-Go 1 code to Go 1.1, use a Go 1.0 tool chain
 to convert the code to Go 1.0 first.
 </p>
 
-<h3 id="gorun">Changes to the go run command</h3>
-
-<p>
-The <a href="/cmd/go/#hdr-Compile_and_run_Go_program"><code>go run</code></a>
-command now runs all files in the current working
-directory if no file arguments are listed. Also, the <code>go run</code>
-command now returns an error if test files are provided on the command line. In
-this sense, "<code>go run</code>" replaces "<code>go run *.go</code>".
-</p>
-
 <h3 id="tags">Build constraints</h3>
 
 <p>