[PATCH] doc: fixup leftover ftp://lists.gnu.org links

[Eric Wong]

Some of these URLs were missing a slash and were missed by
initial search-and-replace regexp :x.

Drop some trailing "\" from the Markdown days while we're at it,
plain-text is the only stable document format.
---
 INSTALL |  2 +-
 README  | 11 ++++++-----
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/INSTALL b/INSTALL
index 56fae1a..d0b8a24 100644
--- a/INSTALL
+++ b/INSTALL
@@ -54,7 +54,7 @@ GNU/Linux users may optionally install the "sleepy_penguin" 
package:
 Please do not hesitate to send plain-text mail to <address@hidden>
 regarding installation and to share your notes/experiences.
 Mailing list archives available at <https://80x24.org/dtas-all/> or
-<ftp://lists.gnu.org/dtas-all>
+<https://lists.gnu.org/archive/html/dtas-all/>
 No subscription is necessary to post to the mailing list.
 
 # COPYRIGHT
diff --git a/README b/README
index d0d4234..0694e9e 100644
--- a/README
+++ b/README
@@ -74,10 +74,11 @@ All feedback (comments, results, feature requests, bug 
reports, patches,
 pull-requests) via plain-text mail to the mailing list is very much
 appreciated.
 
-Please send plain-text mail to the list at <address@hidden>\
-HTML mail will not be read.  dtas is for GUI-phobes, by GUI-phobes.\
-Mailing list archives available at <ftp://lists.gnu.org/dtas-all>
-or <https://80x24.org/dtas-all/>
+Please send plain-text mail to the list at <address@hidden>
+HTML mail will not be read.  dtas is for GUI-phobes, by GUI-phobes.
+Mailing list archives available at <https://80x24.org/dtas-all/> or
+<https://lists.gnu.org/archive/html/dtas-all/>.
+
 No subscription is necessary to post to the mailing list.
 You may also read via:
 NNTP: <nntp://news.public-inbox.org/inbox.comp.audio.dtas>
@@ -86,7 +87,7 @@ Atom: <https://80x24.org/dtas-all/new.atom>
 
 ## Copyright
 
-Copyright 2013-2019 all contributors <address@hidden>\
+Copyright 2013-2019 all contributors <address@hidden>
 License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 
 dtas is copyrighted Free Software by all contributors, see logs