fix: clarify that APM metrics include tags from DD_TAGS (#27099)

* fix: clarify that metrics include tags from DD_TAGS

* Update content/en/tracing/trace_collection/library_config/go.md

Co-authored-by: May Lee <[email protected]>

---------

Co-authored-by: May Lee <[email protected]>

Author: 2 people

content/en/tracing/trace_collection/library_config/go.md

@@ -155,7 +155,7 @@ A JSON array of objects. Each object must have a `"sample_rate"`. The `"name"`,`
 
 `DD_TAGS`
 : **Default**: [] <br>
-A list of default tags to be added to every span and profile. Tags can be separated by commas or spaces, for example: `layer:api,team:intake,key:value` or `layer:api team:intake key:value`.
+A list of default tags to be added to every span, metric, and profile. Tags can be separated by commas or spaces, for example: `layer:api,team:intake,key:value` or `layer:api team:intake key:value`.
 
 ### Agent