Merge pull request #1702 from crobert-1/patch-4

Added the fix to Heretto as well: https://splunk.heretto.com/share/ae798bda-fd8b-4096-a1ef-bd168c2c1f07

Author: jcatera-splunk

gdi/opentelemetry/components/otlphttp-exporter.rst

@@ -142,7 +142,7 @@ For example:
   extensions:
     headers_setter:
       headers:
-        - action: insert
+        - action: upsert
           key: X-SF-TOKEN
           from_context: X-SF-TOKEN