Fix keywords in admonition tests

Author: lcawl

resources/asciidoctor/spec/care_admonition_spec.rb

@@ -233,7 +233,7 @@ def expect_inline_admonition(text)
     include_examples 'care admonition'
   end
   context 'beta serverless' do
-    let(:key) { 'beta_serverless' }
+    let(:key) { 'Serverless:beta' }
     let(:admon_class) { 'warning' }
     let(:default_text) do
       <<~TEXT.strip

resources/asciidoctor/spec/change_admonition_spec.rb

@@ -218,7 +218,7 @@ def expect_inline_admonition(version, text)
     include_examples 'change admonition'
   end
   context 'ga in stack' do
-    let(:key) { 'ga_stack' }
+    let(:key) { 'added' }
     let(:admon_class) { 'note' }
     let(:message) { 'Generally available in Elastic Stack' }
     let(:extra_class) { '' }
@@ -239,7 +239,7 @@ def expect_inline_admonition(version, text)
     include_examples 'change admonition'
   end
   context 'discontinued in stack' do
-    let(:key) { 'discontinued_stack' }
+    let(:key) { 'deleted' }
     let(:admon_class) { 'warning' }
     let(:message) { 'Discontinued' }
     let(:extra_class) { ' u-strikethrough' }