Fix an issue in PostgreSQL capabilities guide

Author: thild42

pages/platform/databases/postgresql_01_capabilities/guide.en-gb.md

@@ -138,9 +138,7 @@ Here are some considerations to take into account when using private network:
 
 ##### Authorised IPs
 
-Once your service is up and running, you will be able to specify IP addresses (or CIDR blocks) to authorise incoming traffic, until then your service will be unreachable. ##### Authorised IPs
-
-Once your service is up and running, you will be able to specify IP addresses (or CIDR blocks) to authorise incoming traffic, until then your service will be unreachable. 
+Once your service is up and running, you will be able to specify IP addresses (or CIDR blocks) to authorise incoming traffic, until then your service will be unreachable.
 
 #### Maximum simultaneous connections