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/database/sql/sql_test.go b/src/database/sql/sql_test.go
index 1c3a685..432a641 100644
--- a/src/database/sql/sql_test.go
+++ b/src/database/sql/sql_test.go
@@ -497,7 +497,7 @@
 	}
 }
 
-// Issue: http://golang.org/issue/2784
+// Issue: https://golang.org/issue/2784
 // This test didn't fail before because we got lucky with the fakedb driver.
 // It was failing, and now not, in github.com/bradfitz/go-sql-test
 func TestTxQuery(t *testing.T) {