Update abstract_base_classes.md

Author: keilw

abstract_base_classes.md

@@ -5,9 +5,9 @@ The reference implementation contains a range of abstract base classes for every
 vital element defined by the JSR 363 API.
 
 While some JSRs offer abstract base classes in their public API, 
-most of them are specialized to their target environment 
+many of these classes here are specialized to their target environment 
 (Java Embedded and ME Embedded in case of the RI) so having them as part of the 
-implementation makes it easier to scale or optimize for other environments in a
+implementation makes it easier to scale and optimize for other environments in a
 different implementation. 
 
 E.g. an alternate implementation (not the RI) [for Java SE 8 and above](https://github.com/unitsofmeasurement/uom-se) could use Lambda