Document update

doc/api/README.md

@@ -11,7 +11,8 @@ following locations:
 - [Award Emoji](award_emoji.md)
 - [Branches](branches.md)
 - [Broadcast Messages](broadcast_messages.md)
-- [Build Variables](build_variables.md)
+- [Project-level Variables](project_level_variables.md)
+- [Group-level Variables](group_level_variables.md)
 - [Commits](commits.md)
 - [Deployments](deployments.md)
 - [Deploy Keys](deploy_keys.md)

doc/api/group_level_variables.md

+# Group-level Variables  API
+
+## List group variables
+
+Get list of a group's variables.
+
+```
+GET /groups/:id/variables
+```
+
+| Attribute | Type    | required | Description         |
+|-----------|---------|----------|---------------------|
+| `id`      | integer/string | yes      | The ID of a group or [URL-encoded path of the group](README.md#namespaced-path-encoding) owned by the authenticated user |
+
+```
+curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v4/groups/1/variables"
+```
+
+```json
+[
+    {
+        "key": "TEST_VARIABLE_1",
+        "value": "TEST_1"
+    },
+    {
+        "key": "TEST_VARIABLE_2",
+        "value": "TEST_2"
+    }
+]
+```
+
+## Show variable details
+
+Get the details of a group's specific variable.
+
+```
+GET /groups/:id/variables/:key
+```
+
+| Attribute | Type    | required | Description           |
+|-----------|---------|----------|-----------------------|
+| `id`      | integer/string | yes      | The ID of a group or [URL-encoded path of the group](README.md#namespaced-path-encoding) owned by the authenticated user   |
+| `key`     | string  | yes      | The `key` of a variable |
+
+```
+curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v4/groups/1/variables/TEST_VARIABLE_1"
+```
+
+```json
+{
+    "key": "TEST_VARIABLE_1",
+    "value": "TEST_1"
+}
+```
+
+## Create variable
+
+Create a new variable.
+
+```
+POST /groups/:id/variables
+```
+
+| Attribute   | Type    | required | Description           |
+|-------------|---------|----------|-----------------------|
+| `id`        | integer/string | yes      | The ID of a group or [URL-encoded path of the group](README.md#namespaced-path-encoding) owned by the authenticated user   |
+| `key`       | string  | yes      | The `key` of a variable; must have no more than 255 characters; only `A-Z`, `a-z`, `0-9`, and `_` are allowed |
+| `value`     | string  | yes      | The `value` of a variable |
+| `protected` | boolean | no       | Whether the variable is protected |
+
+```
+curl --request POST --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v4/groups/1/variables" --form "key=NEW_VARIABLE" --form "value=new value"
+```
+
+```json
+{
+    "key": "NEW_VARIABLE",
+    "value": "new value",
+    "protected": false
+}
+```
+
+## Update variable
+
+Update a group's variable.
+
+```
+PUT /groups/:id/variables/:key
+```
+
+| Attribute   | Type    | required | Description             |
+|-------------|---------|----------|-------------------------|
+| `id`        | integer/string | yes      | The ID of a group or [URL-encoded path of the group](README.md#namespaced-path-encoding) owned by the authenticated user     |
+| `key`       | string  | yes      | The `key` of a variable   |
+| `value`     | string  | yes      | The `value` of a variable |
+| `protected` | boolean | no       | Whether the variable is protected |
+
+```
+curl --request PUT --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v4/groups/1/variables/NEW_VARIABLE" --form "value=updated value"
+```
+
+```json
+{
+    "key": "NEW_VARIABLE",
+    "value": "updated value",
+    "protected": true
+}
+```
+
+## Remove variable
+
+Remove a group's variable.
+
+```
+DELETE /groups/:id/variables/:key
+```
+
+| Attribute | Type    | required | Description             |
+|-----------|---------|----------|-------------------------|
+| `id`      | integer/string | yes      | The ID of a group or [URL-encoded path of the group](README.md#namespaced-path-encoding) owned by the authenticated user     |
+| `key`     | string  | yes      | The `key` of a variable |
+
+```
+curl --request DELETE --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v4/groups/1/variables/VARIABLE_1"
+```

doc/api/build_variables.md → doc/api/project_level_variables.md

-# Build Variables  API
+# Project-level Variables  API
 ## List project variables
-Get list of a project's build variables.
+Get list of a project's variables.
 ```
 GET /projects/:id/variables
@@ -31,7 +31,7 @@ curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/
 ## Show variable details
-Get the details of a project's specific build variable.
+Get the details of a project's specific variable.
 ```
 GET /projects/:id/variables/:key
@@ -55,7 +55,7 @@ curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/
 ## Create variable
-Create a new build variable.
+Create a new variable.
 ```
 POST /projects/:id/variables
@@ -82,7 +82,7 @@ curl --request POST --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitl
 ## Update variable
-Update a project's build variable.
+Update a project's variable.
 ```
 PUT /projects/:id/variables/:key
@@ -109,7 +109,7 @@ curl --request PUT --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitla
 ## Remove variable
-Remove a project's build variable.
+Remove a project's variable.
 ```
 DELETE /projects/:id/variables/:key