message: Make enum AlignableSyntaxSubtype less cluttered.
  The enum definition used twice the vertical space with
  comments that repeated the content of the symbol name.
  Now, add comments at the end and only if it requires more
  detailed information than the symbol name reveals.
diff: @@ -400,30 +400,18 @@ static bool IsAlignableDeclaration(const SyntaxTreeNode& node) {
  // enums, a single value here could apply to a group of syntax tree node types.
  enum class AlignableSyntaxSubtype {
  kDontCare = 0,
  - // named actual parameters
  kNamedActualParameters,
  - // named actual ports
  kNamedActualPorts,
  - // parameter declarations
  kParameterDeclaration,
  - // port declarations
  kPortDeclaration,
  - // net/variable declarations
  - kDataDeclaration,
  - // class member variable declarations
  + kDataDeclaration, // net/variable declarations
  kClassMemberVariables,
  - // case-like items
  kCaseLikeItems,
  - // continuous assignment statements
  kContinuousAssignment,
  - // Constants aligned in enums.
  - kEnumListAssignment,
  - // Blocking assignments.
  + kEnumListAssignment, // Constants aligned in enums.
  kBlockingAssignment,
  - // Nonblocking assignments.
  kNonBlockingAssignment,
  - // Distribution items.
  - kDistItem,
  + kDistItem, // Distribution items.
  };
  static AlignedPartitionClassification AlignClassify(
  