* Fix some typos
* 'project onto'
* unified spelling: 'vector field', 'driven-cavity'
* Explain why we need to explicitly give a function range
* Use consistent format for broken code lines
* Use consistent notation for functions/methods:
  If we talk about the function, just use its name
  without '()' if we talk about an expression or
  function call which happens to have an empty argument
  list, then keep the '()'.