cmd/goimports: update doc.go for go-mode elisp

go-mode does not use go-mode-load now.
Need to use go-mode-autoloads instead.

Change-Id: I3ee2113b41972a1f700d604ea7a6c2d5b59da8bb
Reviewed-on: https://go-review.googlesource.com/42193
Reviewed-by: Alan Donovan <adonovan@google.com>
diff --git a/cmd/goimports/doc.go b/cmd/goimports/doc.go
index ca46d02..316d486 100644
--- a/cmd/goimports/doc.go
+++ b/cmd/goimports/doc.go
@@ -14,7 +14,7 @@
 Then in your .emacs file:
    (setq gofmt-command "goimports")
    (add-to-list 'load-path "/home/you/somewhere/emacs/")
-   (require 'go-mode-load)
+   (require 'go-mode-autoloads)
    (add-hook 'before-save-hook 'gofmt-before-save)
 
 For vim, set "gofmt_command" to "goimports":