Improve 3.2 migration guide re: JUnit & Hamcrest

This commit improves the "Spring Test Dependencies" section of the 3.2
migration guide by correctly explaining that Hamcrest Core is now a
required transitive dependency of JUnit.

Issue: SPR-10251
Polish documentation in Hibernate support classes

This commit fixes some minor typos in Hibernate support classes.
Merge branch '3.2.x' into cleanup-3.2.x

* 3.2.x:
  Polish documentation in Hibernate support classes
  Improve 3.2 migration guide re: JUnit & Hamcrest
Polish formatting

Minor formatting polish across that codebase. Primarily fixing
whitespace issues.