db, json, time, term: change optional to result (#16201)

examples/database/mysql.v

@@ -8,8 +8,8 @@ fn main() {
 		password: ''
 		dbname: 'mysql'
 	}
-	conn.connect()?
-	res := conn.query('show tables')?
+	conn.connect()!
+	res := conn.query('show tables')!
 	for row in res.rows() {
 		println(row.vals.join(', '))
 	}

examples/database/sqlite.v

@@ -1,7 +1,7 @@
 import sqlite
 
 fn main() {
-	db := sqlite.connect(':memory:')?
+	db := sqlite.connect(':memory:')!
 	db.exec("create table users (id integer primary key, name text default '');")
 
 	db.exec("insert into users (name) values ('Sam')")