Update parameter documentation & fix tests

asyncpg/connection.py

@@ -846,7 +846,7 @@ async def copy_to_table(self, table_name, *, source,
             An optional schema name to qualify the table.
 
         :param str where:
-            An optional condition used to filter rows when copying.
+            An optional SQL expression used to filter rows when copying.
 
             .. note::
 
@@ -928,7 +928,7 @@ async def copy_records_to_table(self, table_name, *, records,
             An optional schema name to qualify the table.
 
         :param str where:
-            An optional condition used to filter rows when copying.
+            An optional SQL expression used to filter rows when copying.
 
             .. note::
 
@@ -2408,7 +2408,8 @@ def _detect_server_capabilities(server_version, connection_settings):
         notifications=notifications,
         plpgsql=plpgsql,
         sql_reset=sql_reset,
-        sql_close_all=sql_close_all
+        sql_close_all=sql_close_all,
+        sql_copy_from_where=sql_copy_from_where
     )