'dictionary-completing-read-dictionary' can be used to prompt with
completion based on dictionaries that the server supports.
+---
+*** The default value of 'dictionary-tooltip-dictionary' has changed.
+The new default value is t, which means use the same dictionary as the
+value of 'dictionary-default-dictionary'. The previous default value
+was nil, which effectively disabled 'dictionary-tooltip-mode', even if
+the mode was turned on.
+
** Pp
*** New 'pp-default-function' user option replaces 'pp-use-max-width'.