Fix a bug in T1081 where the macos version of grep is wrongly expected to accept the -P flag and fix a labeling bug in T1201 where a macOS command is wrongly described as a Windows command (#573)

atomics/T1081/T1081.yaml

@@ -29,7 +29,7 @@ atomic_tests:
   executor:
     name: sh
     command: |
-      grep -riP password #{file_path}
+      grep -ri password #{file_path}
 
 - name: Mimikatz & Kittenz
   description: |

atomics/T1201/T1201.yaml

@@ -82,7 +82,7 @@ atomic_tests:
 
 - name: Examine password policy - macOS
   description: |
-    Lists the password policy to console on Windows.
+    Lists the password policy to console on macOS.
 
   supported_platforms:
     - macos