Made some code fixes based on review suggestions

ee/changelogs/unreleased/10359-feature-flag-keep-underscore.yml

 ---
-title: Fix feature displaying flag names in the audit log
+title: Fix displaying feature flag names in the audit log
 merge_request: 14621
 author:
 type: fixed

ee/lib/audit/details.rb

@@ -27,15 +27,15 @@ module Audit
 
       case action.keys.first
       when :add
-        "Added #{target_detail_value}#{@details[:as] ? " as #{@details[:as]}" : ''}"
+        "Added #{target_name}#{@details[:as] ? " as #{@details[:as]}" : ''}"
       when :remove
-        "Removed #{target_detail_value}"
+        "Removed #{target_name}"
       when :failed_login
         "Failed to login with #{oath_label} authentication"
       when :custom_message
         detail_value
       else
-        text_for_change(target_detail_value)
+        text_for_change(target_name)
       end
     end
 
@@ -48,11 +48,11 @@ module Audit
       changed.join(' ')
     end
 
-    def target_detail_value
-      @details[:target_type] == 'Operations::FeatureFlag' ? detail_value : detail_value_with_space
+    def target_name
+      @details[:target_type] == 'Operations::FeatureFlag' ? detail_value : target_name_with_space
     end
 
-    def detail_value_with_space
+    def target_name_with_space
       detail_value.tr('_', ' ')
     end
 

ee/spec/lib/audit/details_spec.rb

@@ -69,26 +69,13 @@ describe Audit::Details do
       end
     end
 
-    context 'feature flag' do
-      let(:feature_flag) do
-        {
-          remove: 'feature_flag',
-          target_type: 'Operations::FeatureFlag'
-        }
-      end
-      let(:custom_message) { "Removed feature_flag" }
-
-      it 'shows message as is' do
-        string = described_class.humanize(feature_flag)
-
-        expect(string).to eq(custom_message)
-      end
-
     context 'failed_login' do
       let(:feature_flag) do
         {
           failed_login: 'google_oauth2',
-            target_type: 'Operations::FeatureFlag'
+          author_name: 'username',
+          target_details: 'testuser',
+          ip_address: '127.0.0.1'
         }
       end
       let(:message) { 'Failed to login with GOOGLE authentication' }
@@ -99,7 +86,6 @@ describe Audit::Details do
         expect(string).to eq message
       end
     end
-    end
 
     context 'deploy key' do
       let(:removal_action) do