[DOCS] Missing parallel_workers setting in the chapter for parallel query

The following documentation comment has been logged on the website: Page: https://www.postgresql.org/docs/9.6/static/parallel-query.html Description: Hi, maybe i overlooked something, but i have hard time to unterstand, why max_parallel_workers_per_gather was not fully utilised in some cases. Af

[DOCS] Missing tablespace_option | effective_io_concurrency

The following documentation comment has been logged on the website: Page: https://www.postgresql.org/docs/9.6/static/sql-altertablespace.html Description: https://www.postgresql.org/docs/9.6/static/sql-altertablespace.html Missing tablespace_option: effective_io_concurrency Should be consitent wi