Add 2.5 release date, and fix a typo.

Author: mitya57

docs/change_log.txt

@@ -7,7 +7,7 @@ next_url: release-2.5.html
 Python-Markdown Changelog
 =========================
 
-[TBD]: Released version 2.5.0 ([Notes](release-2.5.html))
+Sep 12, 2014: Released version 2.5.0 ([Notes](release-2.5.html))
 
 Feb 16, 2014: Released version 2.4.0 ([Notes](release-2.4.html))
 

docs/release-2.5.txt

@@ -177,7 +177,7 @@ What's New in Python-Markdown 2.5
 [JSON]: http://json.org/
 [PyYAML]: http://pyyaml.org/
 
-* The [amonition extension][ae] is no longer considered "experimental."
+* The [admonition extension][ae] is no longer considered "experimental."
 
 [ae]: extensions/admonition.html