ORG-NEWS: Mention org-table-blank-field keybinding removal

The keybinding was dropped in the 9.5 release by 0c4e844c8 (Remove
default binding for org-table-blank-field, 2021-04-28), but the change
didn't come with a NEWS entry.  9.5 is already out, but add an entry
anyway because it will hopefully still help some users, including
those that use the Org that ships with Emacs.

Reported-by: Michael Brand <michael.ch.brand@gmail.com>
Link: https://list.orgmode.org/87lf2wcbqs.fsf@gnu.org

etc/ORG-NEWS

@@ -98,6 +98,15 @@ latest stable version of Org should be compatible with Emacs 28.x,
 
 See [[https://orgmode.org/worg/org-maintenance.html#emacs-compatibility][this note on Worg]] and [[git::519947e508e081e71bf67db99e27b1c171ba4dfe][this commit]].
 
+*** The keybinding for ~org-table-blank-field~ has been removed
+
+If you prefer to keep the keybinding, you can add it back to
+~org-mode-map~ like so:
+
+#+begin_src emacs-lisp
+(define-key org-mode-map (kbd "C-c SPC") #'org-table-blank-field)
+#+end_src
+
 ** New features
 
 *** New citation engine