Backport of docs: fix typo in security/acl into release/1.18.x (#21086)

backport of commit e49fc17

Co-authored-by: nicoche <78445450+nicoche@users.noreply.github.com>

Author: hc-github-team-consul-core

website/content/docs/security/acl/index.mdx

@@ -22,7 +22,7 @@ Refer to the [ACL API reference](/consul/api-docs/acl) and [ACL CLI reference](/
 
 ## Workflow overview
 
-Implementations may vary depending on the needs of the organization, but the following procedure describes the basic workflow for for creating and implementing ACLs:
+Implementations may vary depending on the needs of the organization, but the following procedure describes the basic workflow for creating and implementing ACLs:
 
 1. The person responsible for administrating ACLs in your organization specifies one or more authentication rules to define a [policy](#policies).
 1. The ACL administrator uses the Consul API to generate and link a [token](#tokens) to one or more policies. The following diagram illustrates the relationship between rules, policies, and tokens: