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>
diff --git a/src/net/fd_unix.go b/src/net/fd_unix.go
index f2d7b34..6463b0d 100644
--- a/src/net/fd_unix.go
+++ b/src/net/fd_unix.go
@@ -87,7 +87,7 @@
 		// already been accepted and closed by the server.
 		// Treat this as a successful connection--writes to
 		// the socket will see EOF.  For details and a test
-		// case in C see http://golang.org/issue/6828.
+		// case in C see https://golang.org/issue/6828.
 		if runtime.GOOS == "solaris" {
 			return nil
 		}