Corrects docs for ltm external monitor (#40559)

Examples were incorrect. This fixes them

lib/ansible/modules/network/f5/bigip_monitor_external.py

@@ -87,7 +87,7 @@ author:
 '''
 
 EXAMPLES = r'''
-- name: Create a ...
+- name: Create an external monitor
   bigip_monitor_external:
     name: foo
     password: secret
@@ -95,6 +95,33 @@ EXAMPLES = r'''
     state: present
     user: admin
   delegate_to: localhost
+
+- name: Create an external monitor with variables
+  bigip_monitor_external:
+    name: foo
+    timeout: 10
+    variables:
+      var1: foo
+      var2: bar
+    password: secret
+    server: lb.mydomain.com
+    state: present
+    user: admin
+  delegate_to: localhost
+
+- name: Add a variable to an existing set
+  bigip_monitor_external:
+    name: foo
+    timeout: 10
+    variables:
+      var1: foo
+      var2: bar
+      cat: dog
+    password: secret
+    server: lb.mydomain.com
+    state: present
+    user: admin
+  delegate_to: localhost
 '''
 
 RETURN = r'''