Documentation improvement for pg_trgm

Documentation of word_similarity() and strict_word_similarity() functions
contains some vague wordings which could confuse users.  This patch makes
those wordings more clear.  word_similarity() was introduced in PostgreSQL 9.6,
and corresponding part of documentation needs to be backpatched.

Author: Bruce Momjian, Alexander Korotkov
Discussion: https://postgr.es/m/20180526165648.GB12510%40momjian.us
Backpatch: 9.6, where word_similarity() was introduced

Branch
------
REL_10_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/476ba1ec98a70a67bad8af7d178fb56e3df5aa9b

Modified Files
--------------
doc/src/sgml/pgtrgm.sgml | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

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