A few small formatting/style nits noticed with the JEP 424 updates to FileChannel and FileChannelImpl:

FileChannel.map - the alignment of the param/returns in the javadoc is inconsistent with the existing methods. The indentation of the MemorySession parameter is messed up.

FileChannelImpl.map introduces a 100+ line that will make all future side-by-side diffs hard to read. The formatting/line-breaks seem to have got messed up too.