doc(test/README.md): minor improvements

Author: rouson

test/README.md

@@ -2,38 +2,40 @@ Compiler Support Status
 =======================
 
 This directory contains two categories of unit tests separated into two files:
-* `compiler_test.f90` checks whether a compiler performs finalizes objects in 
-  each scenario that the Fortran 2018 standard requires. 
-* `usage_test.f90` exercises the reference-counter library.
-The compiler tests verify the compiler in isolation, making _no_ use of the
-reference-counter library.
 
-`nagfor` 7.1.0
+* `usage_test.f90` exercises the reference-counter library, whereas
+* `compiler_test.f90` tests the compiler without using reference-counter, 
+
+`compiler_test.f90` verifies that a compiler calls a type's final subroutine
+in each of the scenarios in which the Fortran standard requires finalization
+to occur.
+
+`nagfor` 7.1.0 
 --------------
-The Numerical Algorithms Group [(NAG]) Fortran compiler] passes all of the tests in the
-reference-counter test suite. :trophy:
+:trophy: The Numerical Algorithms Group [(NAG]) Fortran compiler] passes all
+reference-counter tests. 
 
 `gfortran` 12.2.0
 -----------------
-Because the first usage test below causes a segmentation fault,
-exposing `gfortran`'s test failures requires running each test individually
-as follows:
+Because the first usage test listed below causes a segmentation fault,
+obtaining the `gfortran` test results requires skipping that test by, 
+for example, running running individual tests as follows:
 ```
 fpm test -- -f "<description>"
 ```
-where one must replace <description> above with one of the enumerated
-descriptions below (or a corresponding unambiguous substring).
+Replace <description> above with one of the enumerated test descriptions
+below or with a corresponding substring not contained in the first usage 
+test description.
 
-Failing checks in `compiler_test.f90`:
+### Failing checks in `compiler_test.f90`
 1. finalizes a non-allocatable object on the LHS of an intrinsic assignment
 2. finalizes an allocated allocatable LHS of an intrinsic assignment
 3. finalizes a function reference on the RHS of an intrinsic assignment
 4. finalizes a function reference on the RHS of an intrinsic assignment
 5. finalizes a specification expression function result
 
-Failing checks in `usage_test.f90`:
+### Failing checks in `usage_test.f90`
 1. copy points to the same resource as the original
 2. has zero references after a shallow copy goes out of scope
 
 [(NAG) Fortran compiler]: https://www.nag.com/content/nag-fortran-compiler
-