; Improve doc strings of Ethiopic support functions and variables

; Improve doc strings of Ethiopic support functions and variables

* lisp/language/ethio-util.el (ethio-primary-language)
(ethio-secondary-language, ethio-use-colon-for-colon)
(ethio-use-three-dot-question, ethio-quote-vowel-always)
(ethio-W-sixth-always, ethio-sera-to-fidel-buffer)
(ethio-sera-to-fidel-region, ethio-sera-to-fidel-marker)
(ethio-fidel-to-sera-buffer, ethio-fidel-to-sera-region)
(ethio-fidel-to-sera-marker, ethio-get-consonant)
(ethio-fidel-to-tex-buffer, ethio-tex-to-fidel-buffer)
(ethio-fidel-to-java-buffer, ethio-java-to-fidel-buffer)
(ethio-find-file, ethio-write-file, ethio-gemination)
("ethiopic-sera"): Doc fixes.