Prefer HTTPS to FTP and HTTP in documentation

Most of this change is to boilerplate commentary such as license URLs.
This change was prompted by ftp://ftp.gnu.org's going-away party,
planned for November.  Change these FTP URLs to https://ftp.gnu.org
instead.  Make similar changes for URLs to other organizations moving
away from FTP.  Also, change HTTP to HTTPS for URLs to gnu.org and
fsf.org when this works, as this will further help defend against
man-in-the-middle attacks (for this part I omitted the MS-DOS and
MS-Windows sources and the test tarballs to keep the workload down).
HTTPS is not fully working to lists.gnu.org so I left those URLs alone
for now.

1 files changed, 2 insertions, 2 deletions

diff --git a/etc/DEBUG b/etc/DEBUG
index d7d6a0d2385..f5efbe0ff9a 100644
--- a/etc/DEBUG
+++ b/etc/DEBUG
@@ -677,7 +677,7 @@ procedure:
 ** If Emacs causes errors or memory leaks in your X server
 
 You can trace the traffic between Emacs and your X server with a tool
-like xmon, available at ftp://ftp.x.org/contrib/devel_tools/.
+like xmon.
 
 Xmon can be used to see exactly what Emacs sends when X protocol errors
 happen.  If Emacs causes the X server memory usage to increase you can
@@ -951,7 +951,7 @@ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
-along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 
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