Doc: improve documentation about ts_headline() function.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: fac00400846b742a0b8c804b3e075b385d5c3668
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2020-04-09T19:11:08Z
Releases: 12.3
Doc: improve documentation about ts_headline() function.

Now that I've had my nose in that code, I thought the docs about
it left something to be desired.

Files

PathChange+/−
doc/src/sgml/textsearch.sgml modified +57 −47

Documentation touched