Update RELEASE_NOTES.md

Author: jwoolston

RELEASE_NOTES.md

@@ -1,9 +1,9 @@
 #Version structure: A.B.C.D:
 
- - A: Major Version: Incremented for hardware changes, re-architectures, and major functionality differences.
- - B: Minor Version: Incremented for additions of new features.
- - C: Build Number: Incremented for bug fixes and minor improvements within the current feature set.
- - D: Special Build: 0 unless the build is customized for some particular purpose such as hardware verification or experimental testing.
+ - __A: Major Version:__ Incremented for hardware changes, re-architectures, and major functionality differences.
+ - __B: Minor Version:__ Incremented for additions of new features.
+ - __C: Build Number:__ Incremented for bug fixes and minor improvements within the current feature set.
+ - __D: Special Build:__ 0 unless the build is customized for some particular purpose such as hardware verification or experimental testing.
 
 #Release history: