prefer 147.251.115.0/24 over 78.128.250.0/24 network which is full

This MR introduces:

• prefer 147.251.115.0/24 over 78.128.250.0/24 network which is full

follow up from https://rt.cesnet.cz/rt/SelfService/Display.html?id=1114910

@cloud

content/cloud/network/index.md

@@ -6,7 +6,7 @@ draft: false
 
 {{< hint danger >}}
 **Please read the following rules:**
-1. If you are using a [PERSONAL](/cloud/register/#personal-project) project you have to use either the `78-128-250-pers-proj-net` or `147-251-115-pers-proj-net` network to make your instance accessible from an external network (e.g. Internet). Use `public-cesnet-78-128-250-PERSONAL` and `public-muni-147-251-115-PERSONAL` for FIP allocation.
+1. If you are using a [PERSONAL](/cloud/register/#personal-project) project you have to use either the `147-251-115-pers-proj-net` or `78-128-250-pers-proj-net` network to make your instance accessible from an external network (e.g. Internet). Use `public-muni-147-251-115-PERSONAL` or `public-cesnet-78-128-250-PERSONAL` for FIP allocation.
 2. If you are using a [GROUP](/cloud/register/#group-project) project you may choose any of the [`-GROUP`](/cloud/network/#ipv4-group-networking) suffix networks for FIP allocation to make your instance accessible from external network (e.g. Internet).
 3. Violation of network usage may lead to resource removal and reduction of the quotas assigned.
 {{< /hint >}}