Merge branch '24565-fix-api-example-typos' into 'master'

Fix typos in API doc examples

## What does this MR do?

Fixes a typo in the API docs. The `curl` examples in [build_triggers.md](doc/api/build_triggers.md) and [build_variables.md](doc/api/build_variables.md) all have a typo in the auth header. They all say `PRIVATE_TOKEN` when it should be `PRIVATE-TOKEN`.

## What are the relevant issue numbers?
Fixes #24565

See merge request !7514

doc/api/build_triggers.md

@@ -15,7 +15,7 @@ GET /projects/:id/triggers
 | `id`      | integer | yes      | The ID of a project |
 
 ```
-curl --header "PRIVATE_TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v3/projects/1/triggers"
+curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v3/projects/1/triggers"
 ```
 
 ```json
@@ -51,7 +51,7 @@ GET /projects/:id/triggers/:token
 | `token`   | string  | yes      | The `token` of a trigger |
 
 ```
-curl --header "PRIVATE_TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v3/projects/1/triggers/7b9148c158980bbd9bcea92c17522d"
+curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v3/projects/1/triggers/7b9148c158980bbd9bcea92c17522d"
 ```
 
 ```json
@@ -77,7 +77,7 @@ POST /projects/:id/triggers
 | `id`      | integer | yes      | The ID of a project      |
 
 ```
-curl --request POST --header "PRIVATE_TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v3/projects/1/triggers"
+curl --request POST --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v3/projects/1/triggers"
 ```
 
 ```json
@@ -104,7 +104,7 @@ DELETE /projects/:id/triggers/:token
 | `token`   | string  | yes      | The `token` of a trigger |
 
 ```
-curl --request DELETE --header "PRIVATE_TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v3/projects/1/triggers/7b9148c158980bbd9bcea92c17522d"
+curl --request DELETE --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v3/projects/1/triggers/7b9148c158980bbd9bcea92c17522d"
 ```
 
 ```json

doc/api/build_variables.md

@@ -13,7 +13,7 @@ GET /projects/:id/variables
 | `id`      | integer | yes      | The ID of a project |
 
 ```
-curl --header "PRIVATE_TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v3/projects/1/variables"
+curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v3/projects/1/variables"
 ```
 
 ```json
@@ -43,7 +43,7 @@ GET /projects/:id/variables/:key
 | `key`     | string  | yes      | The `key` of a variable |
 
 ```
-curl --header "PRIVATE_TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v3/projects/1/variables/TEST_VARIABLE_1"
+curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v3/projects/1/variables/TEST_VARIABLE_1"
 ```
 
 ```json
@@ -68,7 +68,7 @@ POST /projects/:id/variables
 | `value`   | string  | yes      | The `value` of a variable |
 
 ```
-curl --request POST --header "PRIVATE_TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v3/projects/1/variables" --form "key=NEW_VARIABLE" --form "value=new value"
+curl --request POST --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v3/projects/1/variables" --form "key=NEW_VARIABLE" --form "value=new value"
 ```
 
 ```json
@@ -93,7 +93,7 @@ PUT /projects/:id/variables/:key
 | `value`   | string  | yes      | The `value` of a variable |
 
 ```
-curl --request PUT --header "PRIVATE_TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v3/projects/1/variables/NEW_VARIABLE" --form "value=updated value"
+curl --request PUT --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v3/projects/1/variables/NEW_VARIABLE" --form "value=updated value"
 ```
 
 ```json
@@ -117,7 +117,7 @@ DELETE /projects/:id/variables/:key
 | `key`     | string  | yes      | The `key` of a variable |
 
 ```
-curl --request DELETE --header "PRIVATE_TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v3/projects/1/variables/VARIABLE_1"
+curl --request DELETE --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v3/projects/1/variables/VARIABLE_1"
 ```
 
 ```json