Typo: 'JavaDoc' -> 'Javadoc'.

Author: garydgregory

README.md

@@ -52,7 +52,7 @@ Documentation
 -------------
 
 More information can be found on the [Apache Commons CLI homepage](https://commons.apache.org/proper/commons-cli).
-The [JavaDoc](https://commons.apache.org/proper/commons-cli/javadocs/api-release) can be browsed.
+The [Javadoc](https://commons.apache.org/proper/commons-cli/javadocs/api-release) can be browsed.
 Questions related to the usage of Apache Commons CLI should be posted to the [user mailing list][ml].
 
 Where can I get the latest release?