Add documentation for rbt stamp.
Review Request #6729 — Created Jan. 2, 2015 and submitted
This adds the missing documentation for rbt stamp. It covers the purpose of the command and som use cases for the line it adds.
Built the docs and read through them.
Tool: PEP8 Style Checker Ignored Files: docs/rbtools/rbt/commands/stamp.rst docs/rbtools/rbt/commands/index.rst Tool: Pyflakes Ignored Files: docs/rbtools/rbt/commands/stamp.rst docs/rbtools/rbt/commands/index.rst