Fix Emoji-related documentation

* etc/NEWS: Fix wording and spelling.

* doc/emacs/mule.texi (Input Methods): Add index entries and fix
wording.

* admin/notes/unicode: Update instructions for updating Emacs for
the latest Unicode Standard.

1 files changed, 8 insertions, 5 deletions

diff --git a/admin/notes/unicode b/admin/notes/unicode
index c41b9a6d26d..be51d09d37a 100644
--- a/admin/notes/unicode
+++ b/admin/notes/unicode
@@ -21,11 +21,14 @@ Emacs uses the following files from the Unicode Character Database
   . emoji-sequences.txt
   . BidiCharacterTest.txt
 
-First, the first 10 files need to be copied into admin/unidata/, and
-the file https://www.unicode.org/copyright.html should be copied over
-copyright.html in admin/unidata (some of them might need trailing
-whitespace removed before they can be committed to the Emacs
-repository).
+Emacs also uses the file emoji-test.txt which should be imported from
+the Unicode's Public/emoji/ directory.
+
+First, the first 10 files and emoji-test.txt need to be copied into
+admin/unidata/, and the file https://www.unicode.org/copyright.html
+should be copied over copyright.html in admin/unidata (some of them
+might need trailing whitespace removed before they can be committed to
+the Emacs repository).
 
 Then Emacs should be rebuilt for them to take effect.  Rebuilding
 Emacs updates several derived files elsewhere in the Emacs source