Various doc fixes in dictionary.el

Various doc fixes in dictionary.el

* lisp/net/dictionary.el (dictionary-set-server-var)
(dictionary-server, dictionary-port)
(dictionary-default-dictionary)
(dictionary-default-popup-strategy, dictionary-proxy-server)
(dictionary-proxy-port, dictionary-description-open-delimiter)
(dictionary-description-close-delimiter)
(dictionary-window-configuration, dictionary-selected-window)
(dictionary-position-stack, dictionary-data-stack)
(dictionary-positions, dictionary-current-data)
(dictionary-connection, dictionary-instances)
(dictionary-color-support, dictionary-word-history)
(dictionary-mode, dictionary, dictionary-check-connection)
(dictionary-mode-p, dictionary-send-command)
(dictionary-read-reply-and-split, dictionary-check-reply)
(dictionary-check-initial-reply, dictionary-store-state)
(dictionary-store-positions, dictionary-new-search)
(dictionary-new-search-internal, dictionary-do-search)
(dictionary-display-search-result)
(dictionary-display-word-definition)
(dictionary-special-dictionary, dictionary-set-strategy)
(dictionary-tooltip-dictionary, dictionary-switch-tooltip-mode)
(dictionary-tooltip-mode, global-dictionary-tooltip-mode): Doc fixes
to adhere to our conventions.