Add documentation on rbt land.
Review Request #6724 — Created Jan. 2, 2015 and submitted
This adds a doc page on rbt land, covering basic usage options for remote and local changes, editing commit messages, pushing changes, and all supported options.
Built the docs and read through it. Checked that the links were correct.
Tool: PEP8 Style Checker Ignored Files: docs/rbtools/rbt/commands/land.rst docs/rbtools/rbt/commands/index.rst Tool: Pyflakes Ignored Files: docs/rbtools/rbt/commands/land.rst docs/rbtools/rbt/commands/index.rst