bugfix: use of funcref in settings

doc/denote.txt

@@ -125,15 +125,22 @@ g:denote_fm_md_type		string
 	let g:denote_fm_md_type = 'yaml'
 <
 
-						*g:denote_identifier_fun*
-g:denote_identifier_fun		Funcref
+						*g:Denote_identifier_fun*
+g:Denote_identifier_fun		Funcref
 	Denote allows the use of custom identifiers. This variable, if set,
 	points to a function that generates identifiers for newly created
 	notes. The function is supposed to return a unique string. By default,
-	the identifiers are computed with
+	the variable set as
 >
-	strftime('%Y%m%dT%H%M%S')
+	let g:Denote_identifier_fun = function('denote#meta#identifier_generate')
 <
-or with |rand()| if the function |strftime()| is unavailable.
+which calls |strftime('%Y%m%dT%H%M%S')| if |strftime()| is available, and
+|rand()| otherwise. Another reasonable setting would be to use some uuid
+generator and to specify, e.g.,
+>
+	let g:Denote_identifier_fun = { -> system('uuidgen')
+				\ ->substitute('[^[:xdigit:]]', '', 'g') }
+<
+
 
 vim:tw=78:sw=4:ts=8:noet:ft=help:norl: