doc: use proper reserved IPv4 addresses for documentation, according to RFC 5737

This way one will be able to reliably detect when the example playbook was
forgotten to be upated with correct addresses, as the RFC 5737 addresses are
never used in production (the original RFC 1918 ones often are).

https://github.com/linux-system-roles/network/issues/5

README.md

@@ -251,8 +251,8 @@ network_connections:
       gateway6: 2001:db8::1
 
       address:
-        - 192.168.5.3/24
-        - 10.0.10.3/16
+        - 192.0.2.3/24
+        - 198.51.100.3/26
         - 2001:db8::80/7
 ```
 
@@ -349,7 +349,7 @@ network_connections:
     vlan_id: 6
     ip:
       address:
-        - 192.168.10.5/24
+        - 192.0.2.5/24
       auto6: no
 ```
 

examples/bond-with-vlan.yml

@@ -31,7 +31,7 @@
         vlan_id: 100
         ip:
           address:
-            - "192.168.174.{{ network_iphost }}/24"
+            - "192.0.2.{{ network_iphost }}/24"
 
   roles:
     - network

examples/bridge-with-vlan.yml

@@ -29,7 +29,7 @@
         vlan_id: 100
         ip:
           address:
-            - "192.168.174.{{ network_iphost }}/24"
+            - "192.0.2.{{ network_iphost }}/24"
 
   roles:
     - network

examples/eth-with-vlan.yml

@@ -21,7 +21,7 @@
         vlan_id: 100
         ip:
           address:
-            - "192.168.174.{{ network_iphost }}/24"
+            - "192.0.2.{{ network_iphost }}/24"
 
   roles:
     - network