all: link to https instead of http

The one in misc/makerelease/makerelease.go is particularly bad and
probably warrants rotating our keys.

I didn't update old weekly notes, and reverted some changes involving
test code for now, since we're late in the Go 1.5 freeze. Otherwise,
the rest are all auto-generated changes, and all manually reviewed.

Change-Id: Ia2753576ab5d64826a167d259f48a2f50508792d
Reviewed-on: https://go-review.googlesource.com/12048
Reviewed-by: Rob Pike <r@golang.org>

src/runtime/proc1.go

@@ -21,7 +21,7 @@ var (
 //     M must have an associated P to execute Go code, however it can be
 //     blocked or in a syscall w/o an associated P.
 //
-// Design doc at http://golang.org/s/go11sched.
+// Design doc at https://golang.org/s/go11sched.
 
 const (
 	// Number of goroutine ids to grab from sched.goidgen to local per-P cache at once.