docs: fix simple typo, resvere -> reverse (webpy#700)

There is a small typo in web/application.py. Should read `reverse` rather than `resvere`.

Author: timgates42

web/application.py

@@ -286,7 +286,7 @@ def process(processors):
  print(traceback.format_exc(), file=web.debug)
  raise self.internalerror()
 
- # processors must be applied in the resvere order. (??)
+ # processors must be applied in the reverse order. (??)
  return process(self.processors)
 
  def wsgifunc(self, *middleware):