Update client/auth.go

Co-authored-by: Daniël van Eeden <github@myname.nl>

client/auth.go

@@ -269,7 +269,7 @@ func (c *Conn) writeAuthHandshake() error {
 data[11] = 0x00
 
 // Charset [1 byte]
-// use default collation id 33 here, is utf-8
+// use default collation id 33 here, is `utf8mb3_general_ci`
 collationName := c.collation
 if len(collationName) == 0 {
 collationName = DEFAULT_COLLATION_NAME