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 #10932.

PiperOrigin-RevId: 301461579
diff --git a/site/docs/skylark/testing.md b/site/docs/skylark/testing.md
index 7e54e29..790c6bc 100644
--- a/site/docs/skylark/testing.md
+++ b/site/docs/skylark/testing.md
@@ -137,7 +137,7 @@
 
 # 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`.