Changed project brief to "A Simple Programming Language".
Made minor readability and consistency improvements to documentation.
Standardized doxygen entity naming to prevent collisions.

Due to a collision with a doxygen entity named "functions", established a doxygen entity naming standard that will help avoid collisions.  In the process, corrected minor referencing errors and established better separation between "code" (in code files) and "user" (in dox files) documentation.