### Description
In the documentation documentation for module pipelimit
https://www.kamailio.org/docs/modules/4.2.x/modules/ratelimit.html
has an error in example:
```# perform pipe match for authenticated user
$var(limit) = 20;
if (!pl_check("$au", "traildrop", "$var(limit)")) {
pl_drop();
exit;
}
```
If write algorithm "traildrop" in function pl_check, you every execution will
get return code -2 and pipe not will be created.
### Possible Solutions
Change string "traildrop" on "TAILDROP"
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
kamailio 4.2.3
```
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