Fix relative path for the markdown link (#7202)

Will not wait for long CI push for a md change. Wnat to move master commit list back to green.

docs/README.md

@@ -6,7 +6,7 @@
     [the build guide](./BUILDING.md)
 -   Documentation about running [cirque](https://github.com/openweave/cirque)
     tests can be found in
-    [the cirque test guide](src/test_driver/linux-cirque/README.md)
+    [the cirque test guide](../src/test_driver/linux-cirque/README.md)
 -   Documentation about standard build & development flows using
     [Visual Studio Code](https://code.visualstudio.com/) can be found in
     [the development guide](./VSCODE_DEVELOPMENT.md)