Update specification/common/README.md

Author: pellared

specification/common/README.md

@@ -126,7 +126,7 @@ Attribute Collections are top-level collections of key-value pairs used in
 OpenTelemetry data models.
 Note that they are distinct from [`map<string, AnyValue>`](#mapstring-anyvalue),
 which is a type of [`AnyValue`](#anyvalue) used to represent nested data
-structures within attribute values.
+structures e.g. in attribute values, in [log record body](../logs/data-model.md#field-body).
 
 Implementation MUST by default ensure that the exported attribute collections
 contain only unique keys. The enforcement of uniqueness may be performed