[rust] fix documentation of API authorization in README files (#15352)

fix hierarchy level + align wording across generators

Author: tiffmaelite

modules/openapi-generator/src/main/resources/rust-server/README.mustache

@@ -118,10 +118,10 @@ Method | HTTP request | Description
 {{/model}}{{/models}}
 
 ## Documentation For Authorization
-{{^authMethods}} Endpoints do not require authorization.
-{{/authMethods}}{{#authMethods}}{{#last}} Authentication schemes defined for the API:{{/last}}{{/authMethods}}
+{{^authMethods}}Endpoints do not require authorization.{{/authMethods}}
+{{#hasAuthMethods}}Authentication schemes defined for the API:{{/hasAuthMethods}}
 {{#authMethods}}
-## {{{name}}}
+### {{{name}}}
 {{#isApiKey}}- **Type**: API key
 
 Example

samples/server/petstore/rust-server/output/multipart-v3/README.md

@@ -110,7 +110,7 @@ Method | HTTP request | Description
 
 
 ## Documentation For Authorization
- Endpoints do not require authorization.
+Endpoints do not require authorization.
 
 
 ## Author

samples/server/petstore/rust-server/output/no-example-v3/README.md

@@ -103,7 +103,7 @@ Method | HTTP request | Description
 
 
 ## Documentation For Authorization
- Endpoints do not require authorization.
+Endpoints do not require authorization.
 
 
 ## Author

samples/server/petstore/rust-server/output/openapi-v3/README.md

@@ -184,7 +184,8 @@ Method | HTTP request | Description
 
 ## Documentation For Authorization
 
-## authScheme
+Authentication schemes defined for the API:
+### authScheme
 - **Type**: OAuth
 - **Flow**: accessCode
 - **Authorization URL**: http://example.org

samples/server/petstore/rust-server/output/ops-v3/README.md

@@ -175,7 +175,7 @@ Method | HTTP request | Description
 
 
 ## Documentation For Authorization
- Endpoints do not require authorization.
+Endpoints do not require authorization.
 
 
 ## Author

samples/server/petstore/rust-server/output/petstore-with-fake-endpoints-models-for-testing/README.md

@@ -202,7 +202,8 @@ Method | HTTP request | Description
 
 ## Documentation For Authorization
 
-## petstore_auth
+Authentication schemes defined for the API:
+### petstore_auth
 - **Type**: OAuth
 - **Flow**: implicit
 - **Authorization URL**: http://petstore.swagger.io/api/oauth/dialog
@@ -217,19 +218,19 @@ Example
 Or via OAuth2 module to automatically refresh tokens and perform user authentication.
 ```
 ```
-## api_key
+### api_key
 - **Type**: API key
 
 Example
 ```
 ```
-## api_key_query
+### api_key_query
 - **Type**: API key
 
 Example
 ```
 ```
-## http_basic_test
+### http_basic_test
 - **Type**: HTTP basic authentication
 
 Example

samples/server/petstore/rust-server/output/ping-bearer-auth/README.md

@@ -104,7 +104,8 @@ Method | HTTP request | Description
 
 ## Documentation For Authorization
 
-## bearerAuth
+Authentication schemes defined for the API:
+### bearerAuth
 - **Type**: Bearer token authentication
 
 Example

samples/server/petstore/rust-server/output/rust-server-test/README.md

@@ -125,7 +125,7 @@ Method | HTTP request | Description
 
 
 ## Documentation For Authorization
- Endpoints do not require authorization.
+Endpoints do not require authorization.
 
 
 ## Author