'prompt' argument missing from uifc.input() JSDOC

Also clarify (or try to clarify) that the maxlen argument is required if you
want to specify any kmode flags.

src/sbbs3/js_uifc.c

@@ -1139,7 +1139,7 @@ static jsSyncMethodSpec js_functions[] = {
 	,JSDOCSTR("Pop-up (or down) a message. Pop-down by passing no <i>text</i> argument.")
 	,314
 	},
-	{"input",			js_uifc_input,		0,	JSTYPE_STRING,	JSDOCSTR("[number mode] [,number left] [,number top] [,string default] [,number maxlen] [,number kmode]")
+	{"input",			js_uifc_input,		0,	JSTYPE_STRING,	JSDOCSTR("[number mode] [,number left] [,number top] [,string prompt] [,string default] [,number maxlen [,number kmode]]")
 	,JSDOCSTR("Prompt for a string input")
 	,314
 	},