Suggested SQL injection examples

[kumavale]

I think we should reconsider the number of single quotes.

In the example below, since we don't write single quotes in the query because it's a static placeholder, the attacker would start with
I'm trying to write two single quotes, but when I show it escaped with .simulate(), there are a lot of single quotes and it's hard to see.

ConcatSQL/README.md

Lines 47 to 50 in f5fa442

	let passwd = String::from("'' or 1=1; --"); // User supplied input
	let query = query!("SELECT name FROM users WHERE id={id} AND passwd={passwd}");
	assert_eq!(query.simulate(), "SELECT name FROM users WHERE id='42' AND passwd=''''' or 1=1; --'");

Since the sentence assumed by the attacker is "passwd='" + "' or 1=1; --" + "';".