Update win_firewall_rule.py to include ICMP echo (ping) example (#55013)

* Update win_firewall_rule.py

<!--- Your description here -->
Added example of enabling ICMP protocol, as ping is commonly used for troubleshooting in automation scenarios.  Equivalent netsh command is: 
netsh advfirewall firewall add rule name='ICMP Allow incoming V4 echo request' protocol=icmpv4:8,any dir=in action=allow

+label: docsite_pr

* Remove yaml-breaking space

Removed extraneous space that caused validation to fail.

* Remove more extraneous whitespace

lib/ansible/modules/windows/win_firewall_rule.py

@@ -144,6 +144,7 @@ EXAMPLES = r'''
     protocol: tcp
     state: present
     enabled: yes
+
 - name: Firewall rule to allow port range
   win_firewall_rule:
     name: Sample port range
@@ -153,4 +154,14 @@ EXAMPLES = r'''
     protocol: tcp
     state: present
     enabled: yes
+
+- name: Firewall rule to allow ICMP v4 echo (ping)
+  win_firewall_rule:
+    name: ICMP Allow incoming V4 echo request
+    enabled: yes
+    state: present
+    profiles: private
+    action: allow
+    direction: in
+    protocol: "icmpv4:8,any"
 '''