Fix typos:
  `funciton` | `function`
  `calcuation` | `calculation`
  `spliting` | `splitting`
  `opertor` | `operator`
  `separted` | `separated`
  `sucessfully` | `successfully`
  `Oudented` | `Outdented`
  `Oparator` | `Operator`
  `simplifed` | `simplified`
  `ourselfs` | `ourselves`
  `documenation` | `documentation`
  `excetion` | `exception`
  `mutliple` | `multiple`
  `curent` | `current`
  `mutiple` | `multiple`
11 files changed