Apply suggestions from code review

Co-authored-by: Daniel Nephin <dnephin@gmail.com>

docs/running-without-go.md

@@ -3,18 +3,16 @@
 `gotestsum` may be run without Go as long as the package to be tested has
 already been compiled using `go test -c`, and the `test2json` tool is available.
 
-The `test2json` tool can be compiled without installing go:
+The `test2json` tool can be compiled from the Go source tree so that it can be distributed to the environment that needs it.
 
 ```sh
-GOVERSION=1.13.5
+GOVERSION=1.17.6
 OS=$(uname -s | sed 's/.*/\L&/')
 mkdir -p gopath
 GOPATH=$(realpath gopath)
 HOME=$(realpath ./)
 curl -L --silent https://go.dev/dl/go${GOVERSION}.${OS}-amd64.tar.gz | tar xz -C ./
 env HOME=$HOME GOOS=linux GOARCH=amd64 CGO_ENABLED=0 GOPATH=$GOPATH ./go/bin/go build -o test2json -ldflags="-s -w" cmd/test2json
-rm -rf go
-rm -rf gopath
 mv test2json /usr/local/bin/test2json
 ```