- newfunction(:is_function_available, :type => :rvalue, :doc => <<-EOS
-This function accepts a string as an argument, determines whether the
-Puppet runtime has access to a function by that name. It returns a
-true if the function exists, false if not.
- EOS
- ) do |arguments|
+ newfunction(:is_function_available, :type => :rvalue, :doc => <<-DOC
+ @summary
+ **Deprecated:** Determines whether the Puppet runtime has access to a function by that name.
+
+ This function accepts a string as an argument.
+
+ @return [Boolean]
+ Returns `true` or `false`
+
+ > **Note:* **Deprecated** Will be removed in a future version of stdlib. See
+ [`validate_legacy`](#validate_legacy).
+ DOC
+ ) do |arguments|