Remove mention of the version number from pg_trgm docs
We don't usually mention the version number in similar situations.  So, neither
mention it here.
Reported-by: Bruce Momjian
Discussion:
the purpose of very fast similarity searches. These index types support
the above-described similarity operators, and additionally support
trigram-based index searches for <literal>LIKE</literal>, <literal>ILIKE</literal>,
- <literal>~</literal> and <literal>~*</literal> queries. Beginning in
- <productname>PostgreSQL</productname> 14, these indexes also support
- the equality operator (inequality operators are not supported).
+ <literal>~</literal>, <literal>~*</literal> and <literal>=</literal> queries.
+ Inequality operators are not supported.
Note that those indexes may not be as efficient as regular B-tree indexes
for equality operator.
</para>
