curldown: Fix email address in Copyright

[danielgustafsson]

The curldown conversion accidentally replaced daniel@haxx.se with just daniel.se. This reverts back to the proper email address in the curldown docs as well as in a few other stray places.

Closes: #xxxx

[bagder]

This one is also needed:

diff --git a/lib/optiontable.pl b/lib/optiontable.pl
index 25d6a66deb..511322a347 100755
--- a/lib/optiontable.pl
+++ b/lib/optiontable.pl
@@ -6,11 +6,11 @@ print <<HEAD
  *  Project                     ___| | | |  _ \\| |
  *                             / __| | | | |_) | |
  *                            | (__| |_| |  _ <| |___
  *                             \\___|\\___/|_| \\_\\_____|
  *
- * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) Daniel Stenberg, <daniel\@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
  * are also available at https://curl.se/docs/copyright.html.
  *

[danielgustafsson]

This one is also needed:

Fixed and rebased, no other instances found after some grepping around.

[danielgustafsson]

Pushed to master, thanks for review!