* doc/org-manual.org (Using CDLaTeX to enter math): Clarify ' binding

See https://orgmode.org/list/CAJczNmB95tdWgYcb6gP-B4LH5+W0sBMyA+Z38Fh7Sy+ksfpmbw@mail.gmail.com

doc/org-manual.org

@@ -11112,8 +11112,8 @@ more details see the documentation of CDLaTeX mode):
   #+kindex: '
 
   Pressing the single-quote followed by another character modifies the
-  symbol before point with an accent or a font.  If you wait more than
-  1.5 seconds after the single-quote, a help window pops up.
+  LaTeX symbol before point with an accent or a font.  If you wait
+  more than 1.5 seconds after the single-quote, a help window pops up.
   Character modification works only inside LaTeX fragments; outside
   the quote is normal.