Which JDK are you using? I don't seem to be able to even reproduce this problem. I have:

Apache Maven 3.0.4 (r1232337; 2012-01-17 09:44:56+0100)
Maven home: /opt/java/maven
Java version: 1.7.0_05, vendor: Oracle Corporation
Java home: /Library/Java/JavaVirtualMachines/1.7.0.jdk/Contents/Home/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "mac os x", version: "10.7.4", arch: "x86_64", family: "mac"

and the documentation builds just fine. Do you have the latest JDK 7 for Mac?

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