Fix some type descriptions

Fix some type descriptions based on technical
writing feedback.

app/graphql/types/ci/recent_failures_type.rb

@@ -5,7 +5,7 @@ module Types
     # rubocop: disable Graphql/AuthorizeTypes
     class RecentFailuresType < BaseObject
       graphql_name 'RecentFailures'
-      description 'Represents the recent failure history of a test case.'
+      description 'Recent failure history of a test case.'
 
       connection_type_class(Types::CountableConnectionType)
 

app/graphql/types/ci/test_case_type.rb

@@ -19,7 +19,7 @@ module Types
         description: 'Classname of the test case.'
 
       field :execution_time, GraphQL::FLOAT_TYPE, null: true,
-        description: 'Time it took for the test case to finish in seconds.'
+        description: 'Test case execution time in seconds.'
 
       field :file, GraphQL::STRING_TYPE, null: true,
         description: 'Path to the file of the test case.'

doc/api/graphql/reference/index.md

@@ -5144,7 +5144,7 @@ Represents rules that commit pushes must follow.
 
 ### `RecentFailures`
 
-Represents the recent failure history of a test case.
+Recent failure history of a test case.
 
 | Field | Type | Description |
 | ----- | ---- | ----------- |
@@ -6213,7 +6213,7 @@ Test case in pipeline test report.
 | Field | Type | Description |
 | ----- | ---- | ----------- |
 | `classname` | [`String`](#string) | Classname of the test case. |
-| `executionTime` | [`Float`](#float) | Time it took for the test case to finish in seconds. |
+| `executionTime` | [`Float`](#float) | Test case execution time in seconds. |
 | `file` | [`String`](#string) | Path to the file of the test case. |
 | `name` | [`String`](#string) | Name of the test case. |
 | `recentFailures` | [`RecentFailures`](#recentfailures) | Recent failure history of the test case on the base branch. |