Fix typos.

Fix typos.

* lisp/finder.el (finder-unknown-keywords):
* lisp/progmodes/gdb-mi.el (gdb-jsonify-buffer, gdb-running-threads-count):
* lisp/progmodes/etags.el (tags-table-including): Fix typos in docstrings.

* lisp/cedet/semantic/lex.el (semantic-ignore-comments): Doc fix.

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

* lisp/org/org-agenda.el (org-agenda-hide-tags-regexp):
* lisp/org/org.el (org-refile-targets): Fix typos in docstrings.