Wrap feature flag key in backticks

For formatting and readability purposes

app/graphql/types/base_field.rb

@@ -41,7 +41,7 @@ module Types
     attr_reader :feature_flag
 
     def feature_documentation_message(key, description)
-      "#{description}. Available only when feature flag #{key} is enabled."
+      "#{description}. Available only when feature flag `#{key}` is enabled."
     end
 
     def check_feature_flag(args)

doc/api/graphql/reference/gitlab_schema.graphql

@@ -1949,7 +1949,7 @@ type Epic implements Noteable {
 
   """
   Total weight of open and closed descendant epic's issues. Available only when
-  feature flag unfiltered_epic_aggregates is enabled.
+  feature flag `unfiltered_epic_aggregates` is enabled.
   """
   descendantWeightSum: EpicDescendantWeights
 
@@ -2414,7 +2414,7 @@ type EpicIssue implements Noteable {
   epicIssueId: ID!
 
   """
-  Current health status. Available only when feature flag save_issuable_health_status is enabled.
+  Current health status. Available only when feature flag `save_issuable_health_status` is enabled.
   """
   healthStatus: HealthStatus
 
@@ -3405,7 +3405,7 @@ type Issue implements Noteable {
   epic: Epic
 
   """
-  Current health status. Available only when feature flag save_issuable_health_status is enabled.
+  Current health status. Available only when feature flag `save_issuable_health_status` is enabled.
   """
   healthStatus: HealthStatus
 

doc/api/graphql/reference/index.md

@@ -317,7 +317,7 @@ Represents an epic.
 | `closedAt` | Time | Timestamp of the epic's closure |
 | `createdAt` | Time | Timestamp of the epic's creation |
 | `descendantCounts` | EpicDescendantCount | Number of open and closed descendant epics and issues |
-| `descendantWeightSum` | EpicDescendantWeights | Total weight of open and closed descendant epic's issues. Available only when feature flag unfiltered_epic_aggregates is enabled. |
+| `descendantWeightSum` | EpicDescendantWeights | Total weight of open and closed descendant epic's issues. Available only when feature flag `unfiltered_epic_aggregates` is enabled. |
 | `description` | String | Description of the epic |
 | `downvotes` | Int! | Number of downvotes the epic has received |
 | `dueDate` | Time | Due date of the epic |
@@ -385,7 +385,7 @@ Relationship between an epic and an issue
 | `dueDate` | Time | Due date of the issue |
 | `epic` | Epic | Epic to which this issue belongs |
 | `epicIssueId` | ID! | ID of the epic-issue relation |
-| `healthStatus` | HealthStatus | Current health status. Available only when feature flag save_issuable_health_status is enabled. |
+| `healthStatus` | HealthStatus | Current health status. Available only when feature flag `save_issuable_health_status` is enabled. |
 | `id` | ID | Global ID of the epic-issue relation |
 | `iid` | ID! | Internal ID of the issue |
 | `milestone` | Milestone | Milestone of the issue |
@@ -506,7 +506,7 @@ Autogenerated return type of EpicTreeReorder
 | `downvotes` | Int! | Number of downvotes the issue has received |
 | `dueDate` | Time | Due date of the issue |
 | `epic` | Epic | Epic to which this issue belongs |
-| `healthStatus` | HealthStatus | Current health status. Available only when feature flag save_issuable_health_status is enabled. |
+| `healthStatus` | HealthStatus | Current health status. Available only when feature flag `save_issuable_health_status` is enabled. |
 | `iid` | ID! | Internal ID of the issue |
 | `milestone` | Milestone | Milestone of the issue |
 | `reference` | String! | Internal reference of the issue. Returned in shortened format by default |

spec/graphql/types/base_field_spec.rb

@@ -174,7 +174,7 @@ describe Types::BaseField do
         let(:flag) { :test_flag }
 
         it 'prepends the description' do
-          expect(field.description). to eq 'Test description. Available only when feature flag test_flag is enabled.'
+          expect(field.description). to eq 'Test description. Available only when feature flag `test_flag` is enabled.'
         end
 
         context 'falsey feature_flag values' do