Fix typo

* lisp/org.el (org-scan-tags): Fix typo in docstring.

lisp/org.el

@@ -13862,7 +13862,7 @@ a file becomes an N^2 operation - but with this variable set, it scales
 as N.")
 
 (defun org-scan-tags (action matcher todo-only &optional start-level)
-  "Sca headline tags with inheritance and produce output ACTION.
+  "Scan headline tags with inheritance and produce output ACTION.
 
 ACTION can be `sparse-tree' to produce a sparse tree in the current buffer,
 or `agenda' to produce an entry list for an agenda view.  It can also be