Apply suggestions from code review

Co-authored-by: Colleen McGinnis <[email protected]>

Author: natasha-moore-elastic

troubleshoot/observability/apm-agent-rum-js/apm-real-user-monitoring-javascript-agent.md

@@ -4,8 +4,6 @@ mapped_pages:
   - https://www.elastic.co/guide/en/apm/agent/rum-js/current/troubleshooting.html
 applies_to:
   stack: all
-  serverless:
-    observability: all
 ---
 
 # Troubleshoot APM Real User Monitoring JavaScript Agent [troubleshooting]

troubleshoot/observability/apm-agent-swift/apm-ios-agent.md

@@ -4,8 +4,6 @@ mapped_pages:
   - https://www.elastic.co/guide/en/apm/agent/swift/current/troubleshooting.html
 applies_to:
   stack: all
-  serverless:
-    observability: all
 ---
 
 # Troubleshoot APM iOS Agent [troubleshooting]

troubleshoot/observability/apm/apm-server-performance-diagnostic.md

@@ -3,8 +3,6 @@ mapped_pages:
   - https://www.elastic.co/guide/en/observability/current/apm-performance-diagnostic.html
 applies_to:
   stack: all
-  serverless:
-    observability: all
 ---
 
 # APM Server performance diagnostic [apm-performance-diagnostic]

troubleshoot/observability/apm/enable-apm-server-binary-debugging.md

@@ -4,8 +4,6 @@ mapped_pages:
   - https://www.elastic.co/guide/en/observability/current/apm-enable-apm-server-debugging.html
 applies_to:
   stack: all
-  serverless:
-    observability: all
 ---
 
 

troubleshoot/observability/apm/processing-performance.md

@@ -3,8 +3,6 @@ mapped_pages:
   - https://www.elastic.co/guide/en/observability/current/apm-processing-and-performance.html
 applies_to:
   stack: all
-  serverless:
-    observability: all
 ---
 
 # Processing and performance [apm-processing-and-performance]

troubleshoot/observability/apm/what-happens-when-apm-server-elasticsearch-is-down.md

@@ -3,8 +3,6 @@ mapped_pages:
   - https://www.elastic.co/guide/en/observability/current/apm-server-es-down.html
 applies_to:
   stack: all
-  serverless:
-    observability: all
 ---
 
 # APM Server or Elasticsearch is down [apm-server-es-down]

troubleshoot/observability/troubleshoot-mapping-issues.md

@@ -1,14 +1,12 @@
 ---
-navigation_title: "Mapping issues"
+navigation_title: "Uptime"
 mapped_pages:
   - https://www.elastic.co/guide/en/observability/current/troubleshoot-uptime-mapping-issues.html
 applies_to:
-  stack: all
-  serverless:
-    observability: all
+  stack: deprecated 8.15.0
 ---
 
-# Troubleshoot mapping issues [troubleshoot-uptime-mapping-issues]
+# Troubleshoot Uptime mapping issues [troubleshoot-uptime-mapping-issues]
 
 
 ## Mapping issues [_mapping_issues]