Markdown changes in preparation for GREP

Changed * => ** (Italics)
Changed ** => __ (Bold)

Reason: GREP had trouble distinguishing between 1 and 2 asterisks, changed to unique repeat identifier to help with styling, also avoids issues if asterisk is used in body text.

Changed: List "-" to "+" 

Reason: "-" is too common within the document when used for hyphenation and other, changed to "+" to allow finding through GREP Query.