Update the documentation for emailsDisabled field

Make the description to be more explicit.

app/graphql/types/issue_type.rb

@@ -75,7 +75,7 @@ module Types
           description: 'List of participants in the issue'
     field :emails_disabled, GraphQL::BOOLEAN_TYPE, null: false,
           method: :project_emails_disabled?,
-          description: 'Indicates if a project has email notifications disabled'
+          description: 'Indicates if a project has email notifications disabled: `true` if email notifications are disabled'
     field :subscribed, GraphQL::BOOLEAN_TYPE, method: :subscribed?, null: false, complexity: 5,
           description: 'Indicates the currently logged in user is subscribed to the issue'
     field :time_estimate, GraphQL::INT_TYPE, null: false,

doc/api/graphql/reference/gitlab_schema.graphql

@@ -7646,7 +7646,7 @@ type EpicIssue implements CurrentUserTodos & Noteable {
   dueDate: Time
 
   """
-  Indicates if a project has email notifications disabled
+  Indicates if a project has email notifications disabled: `true` if email notifications are disabled
   """
   emailsDisabled: Boolean!
 
@@ -10185,7 +10185,7 @@ type Issue implements CurrentUserTodos & Noteable {
   dueDate: Time
 
   """
-  Indicates if a project has email notifications disabled
+  Indicates if a project has email notifications disabled: `true` if email notifications are disabled
   """
   emailsDisabled: Boolean!
 

doc/api/graphql/reference/gitlab_schema.json

@@ -21191,7 +21191,7 @@
             },
             {
               "name": "emailsDisabled",
-              "description": "Indicates if a project has email notifications disabled",
+              "description": "Indicates if a project has email notifications disabled: `true` if email notifications are disabled",
               "args": [
 
               ],
@@ -27886,7 +27886,7 @@
             },
             {
               "name": "emailsDisabled",
-              "description": "Indicates if a project has email notifications disabled",
+              "description": "Indicates if a project has email notifications disabled: `true` if email notifications are disabled",
               "args": [
 
               ],

doc/api/graphql/reference/index.md

@@ -1272,7 +1272,7 @@ Relationship between an epic and an issue.
 | `discussions` | DiscussionConnection! | All discussions on this noteable |
 | `downvotes` | Int! | Number of downvotes the issue has received |
 | `dueDate` | Time | Due date of the issue |
-| `emailsDisabled` | Boolean! | Indicates if a project has email notifications disabled |
+| `emailsDisabled` | Boolean! | Indicates if a project has email notifications disabled: `true` if email notifications are disabled |
 | `epic` | Epic | Epic to which this issue belongs |
 | `epicIssueId` | ID! | ID of the epic-issue relation |
 | `healthStatus` | HealthStatus | Current health status. Returns null if `save_issuable_health_status` feature flag is disabled. |
@@ -1541,7 +1541,7 @@ Represents a recorded measurement (object count) for the Admins.
 | `discussions` | DiscussionConnection! | All discussions on this noteable |
 | `downvotes` | Int! | Number of downvotes the issue has received |
 | `dueDate` | Time | Due date of the issue |
-| `emailsDisabled` | Boolean! | Indicates if a project has email notifications disabled |
+| `emailsDisabled` | Boolean! | Indicates if a project has email notifications disabled: `true` if email notifications are disabled |
 | `epic` | Epic | Epic to which this issue belongs |
 | `healthStatus` | HealthStatus | Current health status. Returns null if `save_issuable_health_status` feature flag is disabled. |
 | `humanTimeEstimate` | String | Human-readable time estimate of the issue |