Remove packages from the javadoc that are not user-facing

[wilkinsona]

There are some differences between 2.2 and 2.3, for example 2.3 includes javadoc for org.springframework.boot.autoconfigureprocessor and org.springframework.boot.configurationprocessor.* whereas 2.2 does not. We need to decide which is right and then fix the other one.

[lzy1993lzy]

我也看不懂啊。