cmd/goimports: update doc.go for go-mode elisp
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 <7069e9552f9d110b0a0f326b96f22f63fb99dfc1@google.com>

golang/tools,syreclabs/go-tools,golang/tools,syreclabs/go-tools,syreclabs/go-tools,syreclabs/go-tools,syreclabs/go-tools,golang/tools,syreclabs/go-tools,golang/tools,golang/tools