#### Expected behavior
Following the instructions for generating a server certificate at
https://pulsar.incubator.apache.org/docs/latest/security/tls-transport/#Servercertificate-av2fql
should provide me with a server certificate.
#### Actual behavior
The step labelled "… and sign it with the certificate authority." fails with:
```
proxy.csr.pem: No such file or directory
```
#### Steps to reproduce
Follow the instructions on the page.
#### System configuration
**Pulsar version**: n/a
#### Solution
The step labelled "Generate the certificate request…" needs to be adjusted to
use the "broker.csr.pem" file name as last argument, not "broker.cert.pem" -
it's generating the CSR after all. It should read:
```bash
openssl req -config openssl.cnf \
-key broker.key.pem -new -sha256 -out broker.csr.pem
````
[ Full content available at:
https://github.com/apache/incubator-pulsar/issues/2530 ]
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