Fix graphql schema doc typo

Remove an unnecessary `s` from the graphql
schema documentation.

doc/api/graphql/reference/gitlab_schema.graphql

@@ -14906,7 +14906,7 @@ type Project {
   ): ClusterAgentConnection
 
   """
-  Code coverages summary associated with the project
+  Code coverage summary associated with the project
   """
   codeCoverageSummary: CodeCoverageSummary
 

doc/api/graphql/reference/gitlab_schema.json

@@ -43989,7 +43989,7 @@
             },
             {
               "name": "codeCoverageSummary",
-              "description": "Code coverages summary associated with the project",
+              "description": "Code coverage summary associated with the project",
               "args": [
 
               ],

doc/api/graphql/reference/index.md

@@ -2248,7 +2248,7 @@ Autogenerated return type of PipelineRetry.
 | `boards` | BoardConnection | Boards of the project |
 | `clusterAgent` | ClusterAgent | Find a single cluster agent by name |
 | `clusterAgents` | ClusterAgentConnection | Cluster agents associated with the project |
-| `codeCoverageSummary` | CodeCoverageSummary | Code coverages summary associated with the project |
+| `codeCoverageSummary` | CodeCoverageSummary | Code coverage summary associated with the project |
 | `complianceFrameworks` | ComplianceFrameworkConnection | Compliance frameworks associated with the project |
 | `containerExpirationPolicy` | ContainerExpirationPolicy | The container expiration policy of the project |
 | `containerRegistryEnabled` | Boolean | Indicates if the project stores Docker container images in a container registry |

ee/app/graphql/ee/types/project_type.rb

@@ -145,7 +145,7 @@ module EE
         field :code_coverage_summary,
               ::Types::Ci::CodeCoverageSummaryType,
               null: true,
-              description: 'Code coverages summary associated with the project',
+              description: 'Code coverage summary associated with the project',
               resolver: ::Resolvers::Ci::CodeCoverageSummaryResolver
 
         def self.sast_ci_configuration(project)