Add OTel semantic conventions (#246)

Author: tothmano

query-data/traces.mdx

@@ -188,6 +188,15 @@ Similarly, resource attributes that follow semantic conventions are available un
 
 Custom attributes that don’t match any semantic conventions are nested under the `attributes.custom` map field.
 
+Axiom defaults to the version 1.25.0 of OTel semantic conventions. The supported versions are the following:
+- 1.21.0
+- 1.22.0
+- 1.23.0
+- 1.23.1
+- 1.24.0
+- 1.25.0
+- 1.26.0
+
 ## Querying custom attributes 
 
 Trace spans often include many custom attributes under the `attributes.custom` field. These custom attributes are stored as nested key-value pairs.