Update testing.md
Target must be named "myrules_test" or command `bazel test //mypkg:myrules_test` needs to be changed to `bazel test //mypkg:myrules_tests`
Closes
@@ -137,7 +137,7 @@ myrule(
# Call a macro that defines targets that perform the tests at analysis time,
# and that can be executed with "bazel test" to return the result.
-myrules_test_suite(name = "myrules_tests")
+myrules_test_suite(name = "myrules_test")
```
The test can be run with `bazel test //mypkg:myrules_test`.
