org-entities: Correct unicode symbol of circ

* org-entities.el (org-entities): Change the unicode symbol of circ to
  "ring operator" (#x2218).

TINYCHANGE

lisp/org-entities.el

@@ -265,7 +265,7 @@ packages to be loaded, add these packages to `org-latex-packages-alist'."
 
      "* Other"
      "** Misc. (often used)"
-     ("circ" "\\^{}" nil "ˆ" "^" "^" "ˆ")
+     ("circ" "\\^{}" nil "ˆ" "^" "^" "∘")
      ("vert" "\\vert{}" t "|" "|" "|" "|")
      ("brvbar" "\\textbrokenbar{}" nil "¦" "|" "¦" "¦")
      ("S" "\\S" nil "§" "paragraph" "§" "§")