Fix tag syntax and spellings

Changes:
    - Tag mismatch fix
    - typo fixes

Tested: - NA
Change-Id: Ie90788fda83dff6c7867a924163ee1ab50f0916a
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/openpower/ext_interfaces/test_discovery.robot b/openpower/ext_interfaces/test_discovery.robot
index 9854eeb..d2e8a5f 100644
--- a/openpower/ext_interfaces/test_discovery.robot
+++ b/openpower/ext_interfaces/test_discovery.robot
@@ -112,7 +112,7 @@
 
 
 Discover BMC With Service Type
-    [Documentation]  To get the discoverd BMC list.
+    [Documentation]  To get the discovered BMC list.
     [Arguments]  ${service_type}
 
     # Description of argument(s):