Enhance documentation

## Rationale

While reviewing User documentation (README.md) a few typos were noticed.  While fixing these typos a few opportunities for markdown enhancements (highlighting of product names and module names) were also exploited.

## File Changes

README.md
* Fix a few typos
* Enhance the markdown to better highlight product and module names.
Merge pull request #6 from BrightcoveOS/enhance-docs

Enhance documentation