Update README.md

Co-authored-by: davidlion <[email protected]>

Author: Bill-hbrhbr

README.md

@@ -63,16 +63,9 @@ To build and run unit tests for a specific library:
 task test-<lib_name>
 ```
 
-The default behaviors for ystdlib-cpp unit test building are:
-* As a top-level project, unit tests are built.
-* When included as a subproject, the parent-scope `BUILD_TESTING` flag (true /false/undefined) is
-  strictly respected.
-If you do not wish to build unit tests under any circumstances, you can override the default
-behaviors by setting CMake option `YSTDLIB_CPP_BUILD_TESTING` to `OFF`.
-
-As a top-level CMake project, `ystdlib-cpp` always builds unit tests. When included as a subproject,
-it respects the parent-scope `BUILD_TESTING` flag. In either case, you can turn off unit test
-building by setting option `YSTDLIB_CPP_BUILD_TESTING` to off.
+When generating testing target the CMake variable `BUILD_TESTING` is followed, unless overruled by
+setting `YSTDLIB_CPP_BUILD_TESTING` to false. By default, if built as a top-level project
+`BUILD_TESTING` will be set to true and unit tests will be built.
 
 ## Linting
 Before submitting a pull request, ensure you’ve run the linting commands below and have fixed all