Fix curved quotes in a few places

* lisp/calc/calc-misc.el (calc-help): Fix quoting.
The strings in question are not doc strings, so this partially
undoes the recent change that assumed they were doc strings.
* lisp/cedet/srecode/srt-mode.el (srecode-macro-help):
* lisp/info.el (Info-finder-find-node):
Use curved quotes.
* lisp/emacs-lisp/derived.el (derived-mode-make-docstring):
Also allow curved quotes in doc strings.

lisp/cedet/srecode/srt-mode.el

@@ -258,9 +258,9 @@ we can tell font lock about them.")
 	    (when (class-abstract-p C)
 	      (throw 'skip nil))
 
-	    (princ "`")
+	    (princ "‘")
 	    (princ name)
-	    (princ "'")
+	    (princ "’")
 	    (when (slot-exists-p C 'key)
 	      (when key
 		(princ " - Character Key: ")