Tweak AppStream metadata to satisfy `appstream-util validate'

* etc/emacs.metainfo.xml: `appstream-util validate' suggests that
screenshot height and width attributes should match the actual size of
the image, and that captions be no longer than 50 chars and do not end
in `.'.  Follow those rules.

(cherry picked from commit b3fb93e0e88bb06c1bfdfa6a0c35ec5e146d94e5)

diff --git a/etc/emacs.metainfo.xml b/etc/emacs.metainfo.xml
index cc316fb8ffd5b7adcc09c6964b7ffb64a6dc52cf..ad29940a5c3cf14a0572070f818db0abb877964b 100644 (file)
--- a/etc/emacs.metainfo.xml
+++ b/etc/emacs.metainfo.xml
@@ -55,8 +55,8 @@
  <developer_name>Free Software Foundation</developer_name>
  <screenshots>
   <screenshot type="default">
-    <image type="source" width="632" height="354">https://www.gnu.org/software/emacs/images/appdata-26.png</image>
-    <caption>Editing a Lisp program whilst viewing the Emacs manual.</caption>
+    <image type="source" width="1024" height="576">https://www.gnu.org/software/emacs/images/appdata-26.png</image>
+    <caption>Editing a Lisp program, whilst viewing the manual</caption>
   </screenshot>
  </screenshots>
  <update_contact>emacs-devel_AT_gnu.org</update_contact>