Improvements regarding explanation of parallel execution and detailed node parameters

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/11/using-explain.html
Description:

Proposals for improvement of EXCPLAIN docu
https://www.postgresql.org/docs/current/using-explain.html:
1. There is no mentioning of how parallel execution gets depicted in the
execution plan.
-- how to interpret the actual_time with loops of a parallel executed
node?

2. I am logging execution plans with the help of the awsome auto_explain
plugin in JSON, scrape it from the log and transfer it to ELK stack for
further analysis. Therefore it would be quite helpful to have a reference
documentation about each and every individual node-type (Seq Scan, Hash
Join, Gather, Sort, Aggregate and so on.). Which are their optional fields,
which are mandatory, and most important, what is their semantic?

Kind regards