Consul Docs: Add anonymous token warning to ACL tokens overview (#1484)

## Description

Requested by Deniz Dugan (Security)
- Add anonymous token warning to ACL token overview, anonymous token
section

I updated v1.18-1.22

-
https://unified-docs-frontend-preview-b8zegbmsz-hashicorp.vercel.app/consul/docs/secure/acl/token#anonymous-token
-
https://unified-docs-frontend-preview-b8zegbmsz-hashicorp.vercel.app/consul/docs/v1.21.x/secure/acl/token#initial-management-token
-
https://unified-docs-frontend-preview-b8zegbmsz-hashicorp.vercel.app/consul/docs/v1.20.x/security/acl/tokens#anonymous-token
-
https://unified-docs-frontend-preview-b8zegbmsz-hashicorp.vercel.app/consul/docs/v1.19.x/security/acl/tokens#anonymous-token
-
https://unified-docs-frontend-preview-b8zegbmsz-hashicorp.vercel.app/consul/docs/v1.18.x/security/acl/tokens#anonymous-token

## Links

Jira: [CE-1095]

## Contributor checklists

Review urgency:

- [ ] ASAP: Bug fixes, broken content, imminent releases
- [x] 3 days: Small changes, easy reviews
- [ ] 1 week: Default expectation
- [ ] Best effort: No urgency

Pull request:

- [x] Verify that the PR is set to merge into the correct base branch
- [x] Verify that all status checks passed
- [x] Verify that the preview environment deployed successfully
- [ ] Add additional reviewers if they are not part of assigned groups

Content:

- [ ] I added redirects for any moved or removed pages
- [ ] I followed the [Education style
guide](https://github.com/hashicorp/web-unified-docs/tree/main/docs/style-guide)
- [ ] I looked at the local or Vercel build to make sure the content
rendered correctly

## Reviewer checklist

- [ ] This PR is set to merge into the correct base branch.
- [ ] The content does not contain technical inaccuracies.
- [ ] The content follows the Education content and style guides.
- [ ] I have verified and tested changes to instructions for end users.


[CE-1095]:
https://hashicorp.atlassian.net/browse/CE-1095?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

Author: aimeeu

content/consul/global/partials/alerts/warn-anon-token.mdx

@@ -0,0 +1,5 @@
+<Warning>
+
+All unauthenticated requests to Consul receive permissions from the anonymous token. To ensure clusters remain secure, we recommend using tokens with specific policies instead of an overly permissive anonymous token.
+
+</Warning>

content/consul/v1.18.x/content/docs/security/acl/tokens/index.mdx

@@ -206,7 +206,9 @@ This token has the following attributes (see [Token Attributes](#token-attribute
 - `AccessorID`: `00000000-0000-0000-0000-000000000002`
 - `SecretID`: `anonymous`
 
-The description and policies may be updated, but the anonymous token cannot be deleted.
+You can update the anonymous token's description and policies, but you cannot delete the anonymous token.
+
+@include '../../../global/partials/alerts/warn-anon-token.mdx'
 
 ### Initial management token
 

content/consul/v1.19.x/content/docs/security/acl/tokens/index.mdx

@@ -206,7 +206,9 @@ This token has the following attributes (see [Token Attributes](#token-attribute
 - `AccessorID`: `00000000-0000-0000-0000-000000000002`
 - `SecretID`: `anonymous`
 
-The description and policies may be updated, but the anonymous token cannot be deleted.
+You can update the anonymous token's description and policies, but you cannot delete the anonymous token.
+
+@include '../../../global/partials/alerts/warn-anon-token.mdx'
 
 ### Initial management token
 

content/consul/v1.20.x/content/docs/security/acl/tokens/index.mdx

@@ -206,7 +206,9 @@ This token has the following attributes (see [Token Attributes](#token-attribute
 - `AccessorID`: `00000000-0000-0000-0000-000000000002`
 - `SecretID`: `anonymous`
 
-The description and policies may be updated, but the anonymous token cannot be deleted.
+You can update the anonymous token's description and policies, but you cannot delete the anonymous token.
+
+@include '../../../global/partials/alerts/warn-anon-token.mdx'
 
 ### Initial management token
 

content/consul/v1.21.x/content/docs/secure/acl/token/index.mdx

@@ -229,7 +229,10 @@ The anonymous token is used when a request is made to Consul without specifying
 | `AccessorID` | `00000000-0000-0000-0000-000000000002` |
 | `SecretID`   | `anonymous`                            |
 
-You may update the anonymous token's description and policies, however you cannot delete the token.
+You may update the anonymous token's description and policies, however you
+cannot delete the token.
+
+@include '../../../global/partials/alerts/warn-anon-token.mdx'
 
 ### Initial management token
 

content/consul/v1.22.x/content/docs/secure/acl/token/index.mdx

@@ -229,7 +229,10 @@ The anonymous token is used when a request is made to Consul without specifying
 | `AccessorID` | `00000000-0000-0000-0000-000000000002` |
 | `SecretID`   | `anonymous`                            |
 
-You may update the anonymous token's description and policies, however you cannot delete the token.
+You may update the anonymous token's description and policies, however you
+cannot delete the token.
+
+@include '../../../global/partials/alerts/warn-anon-token.mdx'
 
 ### Initial management token