Be explicit about when yellow favicon is used

changelogs/unreleased/add-canary-favicon.yml

 ---
-title: Add yellow favicon to differientate canary environment
+title: Add yellow favicon when `CANARY=true` to differientate canary environment
 merge_request: 12477
 author:
 type: changed

spec/serializers/status_entity_spec.rb

@@ -26,7 +26,7 @@ describe StatusEntity do
       expect(entity.as_json[:favicon]).to match_asset_path('/assets/ci_favicons/dev/favicon_status_success.ico')
     end
 
-    it 'contains a canavary namespaced favicon if canary env' do
+    it 'contains a canary namespaced favicon if canary env' do
       stub_env('CANARY', 'true')
       expect(entity.as_json[:favicon]).to match_asset_path('/assets/ci_favicons/canary/favicon_status_success.ico')
     end