Fix field masking examples (#6193)

Updating field masking examples that were out of date and incorrect.

Signed-off-by: Terry Quigley <[email protected]>

Author: terryquigleysas

_security/access-control/field-masking.md

@@ -58,14 +58,14 @@ You configure field masking using OpenSearch Dashboards, `roles.yml`, or the RES
 
 ```yml
 someonerole:
-  cluster: []
-  indices:
-    movies:
-      _masked_fields_:
-      - "title"
-      - "genres"
-      '*':
-      - "READ"
+  index_permissions:
+    - index_patterns:
+      - 'movies'
+      allowed_actions:
+        - read
+      masked_fields:
+        - "title"
+        - "genres"
 ```
 
 
@@ -82,14 +82,14 @@ To specify a different algorithm, add it after the masked field:
 
 ```yml
 someonerole:
-  cluster: []
-  indices:
-    movies:
-      _masked_fields_:
-      - "title::SHA-512"
-      - "genres"
-      '*':
-      - "READ"
+  index_permissions:
+    - index_patterns:
+      - 'movies'
+      allowed_actions:
+        - read
+      masked_fields:
+        - "title::SHA-512"
+        - "genres"
 ```
 
 
@@ -103,19 +103,19 @@ hr_employee:
     - index_patterns:
       - 'humanresources'
       allowed_actions:
-        - ...
+        - read
       masked_fields:
         - 'lastname::/.*/::*'
         - '*ip_source::/[0-9]{1,3}$/::XXX::/^[0-9]{1,3}/::***'
 someonerole:
-  cluster: []
-  indices:
-    movies:
-      _masked_fields_:
-      - "title::/./::*"
-      - "genres::/^[a-zA-Z]{1,3}/::XXX::/[a-zA-Z]{1,3}$/::YYY"
-      '*':
-      - "READ"
+  index_permissions:
+    - index_patterns:
+      - 'movies'
+      allowed_actions:
+        - read
+      masked_fields:
+        - "title::/./::*"
+        - "genres::/^[a-zA-Z]{1,3}/::XXX::/[a-zA-Z]{1,3}$/::YYY"
 
 ```