Add missing documents

[nobu]

rdoc -C before this:

  Files:       116

  Classes:     104 (  2 undocumented)
  Modules:      12 (  1 undocumented)
  Constants:    67 ( 22 undocumented)
  Attributes:  239 (  5 undocumented)
  Methods:    1059 ( 84 undocumented)

  Total:      1481 (114 undocumented)
   92.30% documented

After:

  Files:       116

  Classes:     103 ( 0 undocumented)
  Modules:      12 ( 0 undocumented)
  Constants:    46 ( 2 undocumented)
  Attributes:  238 ( 0 undocumented)
  Methods:     963 (21 undocumented)

  Total:      1362 (23 undocumented)
   98.31% documented