Review fixes for log4j-appender-1.2:javaagent (open-telemetry#18189)

Co-authored-by: otelbot <197425009+otelbot@users.noreply.github.com>

Author: otelbot[bot]

instrumentation/log4j/log4j-appender-1.2/metadata.yaml

@@ -6,23 +6,30 @@ features:
   - LOGGING_BRIDGE
 configurations:
   - name: otel.instrumentation.log4j-appender.experimental-log-attributes
+    declarative_name: java.log4j_appender.experimental_log_attributes/development
     description: >
       Enables the capture of experimental log attributes, including thread name and thread ID.
     type: boolean
     default: false
   - name: otel.instrumentation.log4j-appender.experimental.capture-mdc-attributes
+    declarative_name: java.log4j_appender.capture_mdc_attributes/development
     description: >
       Controls which MDC attributes to capture. Use "*" to capture all MDC attributes or provide a
       comma-separated list of specific keys.
     type: list
     default: ''
+    examples:
+      - "custom-mdc-key"
+      - "key1,key2,key3"
   - name: otel.instrumentation.log4j-appender.experimental.capture-code-attributes
+    declarative_name: java.log4j_appender.capture_code_attributes/development
     description: >
       Enables the capture of code location attributes, including file path, class name, method
       name, and line number.
     type: boolean
     default: false
   - name: otel.instrumentation.log4j-appender.experimental.capture-event-name
+    declarative_name: java.log4j_appender.capture_event_name/development
     description: >
       Enables the capture of the event name from the MDC attribute "event.name" and sets it as the
       log record's event name.