JUnit 4.6 contains two Assert classes. The first one junit.framework.Assert is used by Arquillian however this one is there only for a backward compatibility with JUnit 3. The other one, org.junit.Assert, is recommended.

The issue with that is that in docs, the code samples do not contain imports. Therefore, if a user copies the code, code completion will suggest importing the second Assert (org.junit.Assert), in which the assertEquals(double, double) method is deprecated and the test will fail.

I suggest to modify the examples to:
a) use org.junit.Assert
b) use assertEquals(double, double, double) method
c) propagate this change to docs