Revise toolchaintest/README.md (#2565)

Author: dagood

toolchaintest/README.md

@@ -1,21 +1,30 @@
-# Toolchain Tests
+# Toolchain tests
 
-Tests for Microsoft-specific Go toolchain behavior, kept outside the upstream Go patch set. The repository's build and CI test runners run this module alongside the upstream tests.
+This module tests Microsoft-specific Go toolchain behavior.
+It's maintained outside the upstream Go patch set.
+The repository's build and CI test runners run this module alongside the upstream tests.
 
-After [building the toolchain](../eng/doc/DeveloperGuide.md#build-the-go-toolchain), run from this directory:
+After [building the toolchain](../eng/doc/DeveloperGuide.md#build-the-go-toolchain), run this command from the current directory:
 
 ```sh
 ../go/bin/go test -count=1
 ```
 
-On Windows, use `..\go\bin\go.exe`.
+On Windows:
 
-The CLI tests default to the Go executable in the running test binary's GOROOT. To use a different toolchain, including when running the tests with a bootstrap Go installation:
+```pwsh
+..\go\bin\go.exe test -count=1
+```
+
+By default, the CLI tests use the Go executable in the test binary's `GOROOT`.
+To use a different toolchain, such as when you run the tests with a bootstrap Go installation, specify the Go executable:
 
 ```sh
 go test -count=1 -go=/path/to/microsoft-go/bin/go
 ```
 
-The public `go/build` API tests use the toolchain that compiles the test binary. Run the module with the built Microsoft Go executable to test both APIs and CLI behavior with that toolchain.
+The public `go/build` API tests use the toolchain that compiled the test binary.
+Run the module with the built Microsoft build of Go executable to test the API and CLI behavior of that toolchain.
 
-The module has no external dependencies. It covers system-crypto build tags, cross-compilation, build information, and FIPS-mode command behavior.
+The module has no external dependencies.
+It tests system-crypto build tags, cross-compilation, build information, and FIPS-mode command behavior.