message: Update "lifecycle methods" guide in CONTRIBUTING.md
diff: @@ -22,11 +22,11 @@ for more good guidelines to follow.
  - default-or-argument-bearing 'user' constructors
  - - declaration-or-deletion-of-copy-contructor
  - declaration-or-deletion-of-move-constructor
  + - declaration-or-deletion-of-move-assignment-operator
  + - declaration-or-deletion-of-copy-constructor
  - declaration-or-deletion-of-copy-assignment-operator
  - - declaration-or-deletion-of-move-assignment-operator
  - declaration-of-dtor
  