Fix typos in docstrings, comments and ChangeLogs.

Fix typos in docstrings, comments and ChangeLogs.

* etc/tutorials/TUTORIAL.es: Fix typos.

* lisp/cedet/semantic/symref/list.el (semantic-symref-list-rename-open-hits):
  Fix typo in message.
  (semantic-symref-list-map-open-hits): Fix typo in docstring.

* lisp/erc/erc-xdcc.el (erc-xdcc-help-text): Fix typo in docstring.

* lisp/gnus/nnmail.el (nnmail-fancy-expiry-targets): Fix typo in docstring.

* lisp/international/mule.el (define-coding-system):
* lisp/international/titdic-cnv.el (quail-cxterm-package-ext-info):
* composite.el (compose-region): Fix typo in docstring.

* lisp/org/org-agenda.el (org-prefix-category-length)
  (org-prefix-category-max-length): Fix typos in docstrings.

* src/font.c (Ffont_variation_glyphs):
* ccl.c (Fccl_execute_on_string): Fix typo in docstring.