doc/go1.10: fix HTML start tag

Change-Id: I33f14ea1d58e18081bae3f16c87d11312249c842
Reviewed-on: https://go-review.googlesource.com/82835
Reviewed-by: Ian Lance Taylor <[email protected]>

Author: tklauser

doc/go1.10.html

@@ -150,7 +150,7 @@ <h3 id="build">Build &amp; Install</h3>
 </p>
 
 <p>
-The <code>go</code>&nbsp;</code>install</code> command now installs only the
+The <code>go</code>&nbsp;<code>install</code> command now installs only the
 packages and commands listed directly on the command line.
 For example, <code>go</code> <code>install</code> <code>cmd/gofmt</code>
 installs the gofmt program but not any of the packages on which it depends.