fixed certificate.md

Author: tiamo

docs/certificat.md renamed to docs/certificate.md

@@ -1,20 +1,17 @@
 
-
-Generate a couple private and public key 
+Generate a couple private and public key: 
 
 ```bash
-openssl req -newkey rsa:2018 -nodes -keyout privkey.pem -x509 -days 365 -out public.pem
+openssl req -newkey rsa:2048 -nodes -keyout privkey.pem -x509 -days 365 -out public.pem
 ```
 
-merge them into a p12 file :
-
+Merge them into a p12 file:
 
 ```bash
 openssl pkcs12 -inkey privkey.pem -in public.pem -export -out server.p12
 ```
 
-Check your p12 file :
-
+Check your p12 file:
 
 ```bash
 openssl pkcs12 -in server.p12 -noout -info