Add to documentation for oncall rotation types

ee/app/graphql/mutations/incident_management/oncall_rotation/create.rb

@@ -40,7 +40,7 @@ module Mutations
         argument :participants,
                  [Types::IncidentManagement::OncallUserInputType],
                  required: true,
-                 description: 'The usernames of users participating in the on-call rotation.'
+                 description: 'The usernames of users participating in the on-call rotation. A maximum limit of 100 participants applies.'
 
         def resolve(iid:, project_path:, participants:, **args)
           project = Project.find_by_full_path(project_path)

ee/app/graphql/mutations/incident_management/oncall_rotation/update.rb

@@ -35,7 +35,7 @@ module Mutations
         argument :participants,
                  [Types::IncidentManagement::OncallUserInputType],
                  required: false,
-                 description: 'The usernames of users participating in the on-call rotation.'
+                 description: 'The usernames of users participating in the on-call rotation. A maximum limit of 100 participants applies.'
 
         def resolve(id:, **args)
           rotation = authorized_find!(id: id)

ee/app/graphql/types/incident_management/oncall_rotation_active_period_input_type.rb

@@ -9,11 +9,11 @@ module Types
 
       argument :start_time, GraphQL::STRING_TYPE,
                 required: true,
-                description: 'The start of the rotation active period.'
+                description: 'The start of the rotation active period in 24 hour format, for example "18:30".'
 
       argument :end_time, GraphQL::STRING_TYPE,
                 required: true,
-                description: 'The end of the rotation active period.'
+                description: 'The end of the rotation active period in 24 hour format, for example "18:30".'
     end
     # rubocop: enable Graphql/AuthorizeTypes
   end