Utils: Add some missing documentation.
Utils: Add some missing documentation.

(cherry picked from commit 13828ce3110efe94a4f02cf703a891c7693ea26e)

HashEngineering/dashj,HashEngineering/darkcoinj,HashEngineering/dashj,HashEngineering/dashj,HashEngineering/darkcoinj,HashEngineering/dashj,HashEngineering/darkcoinj