* Add example for the function operator
* change the example to explicitly use the function operator
* Use the standard example format, add detailed explanations and add an introductory function to gradually increase complexity
* add missing "the"
* add the end of the explanation for the diff.fields function
* Update function Operator (Examples).tid
Show the name of the plugin for the subtiddler used in the demo
* fix example number
* Update function Operator (Examples).tid
fix typo
