doc: add reference to JSON Lines in addition to NDJSON

This issue has been fixed already, but given this format is commonly
known as JSON Lines as well. Add to this the documentation and use this
hook to close the original issue.

Fixes bpftrace#2902

Author: amscanne

man/adoc/bpftrace.adoc

@@ -97,7 +97,7 @@ Valid values are::
 *json* +
 *text*
 
-Note: the json output is ndjson, meaning each line of the streamed output is a single blob of valid json.
+The JSON output is compatible with NDJSON and JSON Lines, meaning each line of the streamed output is a single blob of valid JSON.
 
 === *-h, --help*