JDK13+ requires H2, JDK11 does not care. Fix it up.
Change-Id: Id3898df1112797d8e026934fdc5cae20860871ed
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>
/**
* Implementation of {@link ManagedNewTransactionRunner} with automatic transparent retries.
*
- * <h3>Details about the threading model used by this class</h3>
+ * <h2>Details about the threading model used by this class</h2>
*
* <p>This class runs the first attempt to call the delegated {@link ManagedNewTransactionRunner},
* which typically is a {@link ManagedNewTransactionRunnerImpl} which safely invokes {@link WriteTransaction#commit()},