Update release instructions for new archive locations.

ftp.mozilla.org is now s3-backed archive.mozilla.org.
Old urls should redirect.

doc/release.txt

@@ -12,13 +12,13 @@ Source release:
 - Upload source packge 'opusfile-${version}.tar.gz'
   to website and verify file permissions.
 - Update checksum files on website.
-- Update links on <http://www.opus-codec.org/downloads/>.
-- Add a copy of the documentation to <http://www.opus-codec.org/docs/>
+- Update links on <https://www.opus-codec.org/downloads/>.
+- Add a copy of the documentation to <https://www.opus-codec.org/docs/>
   and update the links.
 
 Releases are commited to https://svn.xiph.org/releases/opus/
 which propagates to downloads.xiph.org, and copied manually
-to https://ftp.mozilla.org/pub/mozilla.org/opus/
+to https://archive.mozilla.org/pub/opus/
 
 Win32 binaries:
 
@@ -68,5 +68,5 @@ Win32 binaries:
 - Add doc/latex/refman as docs/opusfile_api-${version}.pdf on opus-codec.org
 - Add doc/html as docs/opusfile_api-${version} on opus-codec.org
 
-Binary releases are copied manually to
-ftp.mozilla.org:/pub/mozilla.org/opus/win32/
+Binary releases are copied manually to s3 to appear at
+https://archive.mozilla.org/pub/mozilla.org/opus/win32/