message: doc: fix internal typo
  PR
diff: //
  // It can do more than the DFA can (specifically, record capture locations
  // and execute Unicode word boundary assertions), but at a slower speed.
  -// Specifically, the Pike VM exectues a DFA implicitly by repeatedly expanding
  +// Specifically, the Pike VM executes a DFA implicitly by repeatedly expanding
  // epsilon transitions. That is, the Pike VM engine can be in multiple states
  // at once where as the DFA is only ever in one state at a time.
  //
  