user/all-features-by-client.md: add spell checker

https://jami.net/dev-update-14/ GitLab: jami-client-qt#1997 Change-Id: I8596d477e19cb1042d9fd29cfdcc56edd1fa126d

user/all-features-by-client.md: add spell checker
010d0300 · ovari · fc8a5358 · 010d0300
Commit 010d0300 authored 1 week ago by ovari
--- a/user/all-features-by-client.md
+++ b/user/all-features-by-client.md
@@ -157,6 +157,12 @@
  - ×
  - ×
  - ×
+* - Spell checker
+  - ✓
+  - ✓
+  - ✓
+  - ✓
+  - ✓
 * - Web link previews
  - ✓
  - ✓