unix: single space after period in generated zptrace header

Fix the header in the generated zptrace*_linux.go files to consistently
use single space after a period.

Change-Id: I527f27a68e14bc103639b1dd5734ec06ae267e01
Reviewed-on: https://go-review.googlesource.com/73875
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/unix/zptracemips_linux.go b/unix/zptracemips_linux.go
index 23f662a..c431131 100644
--- a/unix/zptracemips_linux.go
+++ b/unix/zptracemips_linux.go
@@ -1,4 +1,4 @@
-// Code generated by linux/mkall.go generatePtracePair(mips, mips64).  DO NOT EDIT.
+// Code generated by linux/mkall.go generatePtracePair(mips, mips64). DO NOT EDIT.
 
 // +build linux
 // +build mips mips64