doc: document thread subqueries
authorDavid Bremner <david@tethera.net>
Sat, 5 May 2018 15:59:28 +0000 (12:59 -0300)
committerDavid Bremner <david@tethera.net>
Mon, 7 May 2018 11:42:53 +0000 (08:42 -0300)
commitf2e6f76a046492650713c1c3f1f1a19f49de59ea
tree217ef22756a44c30b3288bbe591bd9d995773f46
parentf0131af6c59704e29d58eb74ed5e4bc298455272
doc: document thread subqueries

Mention both performance and quoting issues.
doc/man7/notmuch-search-terms.rst