[#6069] fix(docs): Fix access-control.md (#6199)

### What changes were proposed in this pull request?

Fix the wrong document information about revoke roles from role

### Why are the changes needed?

Fix: #6069 

### Does this PR introduce _any_ user-facing change?

No

### How was this patch tested?

local test.

Co-authored-by: Lord of Abyss <[email protected]>

docs/security/access-control.md

@@ -817,7 +817,7 @@ curl -X PUT -H "Accept: application/vnd.gravitino.v1+json" \
 
 ```java
 GravitinoClient client = ...
-Group group = client.grantRolesToGroup(Lists.newList("role1"), "group1");
+Group group = client.revokeRolesFromGroup(Lists.newList("role1"), "group1");
 ```
 
 </TabItem>