Fix capitalization of URL in a GraphQL description

app/graphql/types/grafana_integration_type.rb

@@ -9,7 +9,7 @@ module Types
     field :id, GraphQL::ID_TYPE, null: false,
       description: 'Internal ID of the Grafana integration'
     field :grafana_url, GraphQL::STRING_TYPE, null: false,
-      description: 'Url for the Grafana host for the Grafana integration'
+      description: 'URL for the Grafana host for the Grafana integration'
     field :enabled, GraphQL::BOOLEAN_TYPE, null: false,
       description: 'Indicates whether Grafana integration is enabled'
     field :created_at, Types::TimeType, null: false,

doc/api/graphql/reference/gitlab_schema.graphql

@@ -3553,7 +3553,7 @@ type GrafanaIntegration {
   enabled: Boolean!
 
   """
-  Url for the Grafana host for the Grafana integration
+  URL for the Grafana host for the Grafana integration
   """
   grafanaUrl: String!
 

doc/api/graphql/reference/gitlab_schema.json

@@ -10207,7 +10207,7 @@
             },
             {
               "name": "grafanaUrl",
-              "description": "Url for the Grafana host for the Grafana integration",
+              "description": "URL for the Grafana host for the Grafana integration",
               "args": [
 
               ],

doc/api/graphql/reference/index.md

@@ -577,7 +577,7 @@ Autogenerated return type of EpicTreeReorder
 | ---   |  ---- | ----------  |
 | `createdAt` | Time! | Timestamp of the issue's creation |
 | `enabled` | Boolean! | Indicates whether Grafana integration is enabled |
-| `grafanaUrl` | String! | Url for the Grafana host for the Grafana integration |
+| `grafanaUrl` | String! | URL for the Grafana host for the Grafana integration |
 | `id` | ID! | Internal ID of the Grafana integration |
 | `token` **{warning-solid}** | String! | **Deprecated:** Plain text token has been masked for security reasons. Deprecated in 12.7 |
 | `updatedAt` | Time! | Timestamp of the issue's last activity |