OBSDOCS-1097: Add more two callouts in the File Storage Extension section

Author: max-cx

observability/otel/otel-collector/otel-collector-extensions.adoc

@@ -142,10 +142,10 @@ include::snippets/technology-preview.adoc[]
     exporters:
       otlp:
         sending_queue:
-          storage: file_storage/all_settings
+          storage: file_storage/all_settings # <7>
 
     service:
-      extensions: [file_storage/all_settings]
+      extensions: [file_storage/all_settings] # <8>
       pipelines:
         traces:
           receivers: [otlp]
@@ -158,6 +158,8 @@ include::snippets/technology-preview.adoc[]
 <4> Specifies the directory in which the compactor stores the telemetry data.
 <5> Defines the maximum size of the compaction transaction. To ignore the transaction size, set to zero. If omitted, the default is `+65536+` bytes.
 <6> When set, forces the database to perform an `fsync` call after each write operation. This helps to ensure database integrity if there is an interruption to the database process, but at the cost of performance.
+<7> Buffers the OTLP Exporter data on the local file system.
+<8> Starts the File Storage Extension by the Collector.
 
 [id="oidcauth-extension_{context}"]
 == OIDC Auth Extension