doc fixes

Author: Richard Jones

doc/features.txt

@@ -12,7 +12,7 @@ from Ka-Ping Yee in the Software Carpentry "Track" design competition.
  - two templates included in the distribution for you to base your tracker on
  - play with the demo, customise it and then use *it* as the template for
    your production tracker
- - requires *no* additional support software - python (2.1+) is
+ - requires *no* additional support software - python (2.3+) is
    enough to get you going
  - easy to set up higher-performance storage backends like sqlite_,
    metakit_, mysql_ and postgresql_

doc/whatsnew-0.8.txt

@@ -65,7 +65,7 @@ Logging of internal messages
 Roundup's previously ad-hoc logging of events has been cleaned up and is
 now configured in a single place in the tracker configuration file.
 
-The `customization documentation`_ has more details on how this is
+The `customisation documentation`_ has more details on how this is
 configured.
 
 roundup-mailgw now logs fatal exceptions rather than mailing them to admin.
@@ -190,4 +190,4 @@ Web server
   The builtin web server may now perform HTTP Basic Authentication by
   itself.
 
-.. _`customization documentation`: customizing.html
+.. _`customisation documentation`: customizing.html