Capitalized "[Return]" to adhere to code standards.

Capitalized "[Return]" in places it wasn't.
This commit is style changes only.

Change-Id: I218c87c136ead38af3e310aa2711efaa00df2ca4
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/tests/test_led.robot b/tests/test_led.robot
index 51e3eb5..b31c384 100644
--- a/tests/test_led.robot
+++ b/tests/test_led.robot
@@ -203,7 +203,7 @@
    ${resp}=   OpenBMC Post Request   ${LED_CONTROL}${args}/action/GetLedState   data=${data}
    should be equal as strings   ${resp.status_code}   ${HTTP_OK}
    ${json}=   to json   ${resp.content}
-   [return]    ${json['data'][1]}
+   [Return]    ${json['data'][1]}
 
 Set On
    [Arguments]    ${args}