samples: stepper: tmc50xx minor fixes

fix minor spacing and nomeclature errors in tmc50xx stepper sample

Signed-off-by: Jilay Pandya <jilay.pandya@outlook.com>
diff --git a/samples/drivers/stepper/tmc50xx/README.rst b/samples/drivers/stepper/tmc50xx/README.rst
index 17191c3..75e2dd2 100644
--- a/samples/drivers/stepper/tmc50xx/README.rst
+++ b/samples/drivers/stepper/tmc50xx/README.rst
@@ -2,7 +2,6 @@
    :name: TMC50XX stepper
    :relevant-api: stepper_interface
 
-
    Rotate a TMC50XX stepper motor and change velocity at runtime.
 
 Description
@@ -46,4 +45,4 @@
    stepper_callback steps completed changing direction
    stepper_callback steps completed changing direction
 
-<repeats endlessly>
+   <repeats endlessly>
diff --git a/samples/drivers/stepper/tmc50xx/sample.yaml b/samples/drivers/stepper/tmc50xx/sample.yaml
index fd60075..dddd010 100644
--- a/samples/drivers/stepper/tmc50xx/sample.yaml
+++ b/samples/drivers/stepper/tmc50xx/sample.yaml
@@ -1,7 +1,7 @@
 sample:
   name: TMC50XX Stepper Sample
 tests:
-  sample.stepper.tmc50xx:
+  sample.drivers.stepper.tmc50xx:
     harness: stepper
     tags: stepper
     platform_allow: nucleo_g071rb