Merge branch 'docs-update-pipelines-api-detail' into 'master'

Fix format for api payload examples

Closes #31157

See merge request gitlab-org/gitlab!38030

doc/api/README.md

@@ -545,7 +545,7 @@ https://gitlab.example.com/api/v4/projects/import
 
 ### Array of hashes
 
-`variables` is a parameter of type `array` containing hash key/value pairs `[{ 'key' => 'UPLOAD_TO_S3', 'value' => 'true' }]`:
+`variables` is a parameter of type `array` containing hash key/value pairs `[{ 'key': 'UPLOAD_TO_S3', 'value': 'true' }]`:
 
 ```shell
 curl --globoff --request POST --header "PRIVATE-TOKEN: <your_access_token>" \

doc/api/pipelines.md

@@ -213,7 +213,7 @@ POST /projects/:id/pipeline
 |-------------|---------|----------|---------------------|
 | `id`        | integer/string | yes | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) owned by the authenticated user |
 | `ref`       | string  | yes      | Reference to commit |
-| `variables` | array   | no       | An array containing the variables available in the pipeline, matching the structure `[{ 'key' => 'UPLOAD_TO_S3', 'variable_type' => 'file', 'value' => 'true' }]` |
+| `variables` | array   | no       | An array containing the variables available in the pipeline, matching the structure `[{ 'key': 'UPLOAD_TO_S3', 'variable_type': 'file', 'value': 'true' }]` |
 
 ```shell
 curl --request POST --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/projects/1/pipeline?ref=master"