BIND 10 #469: Improvement of RBTree documentation

[BIND 10 Development]

#469: Improvement of RBTree documentation
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                 Reporter:  vorner   |                Owner:  UnAssigned
                     Type:           |               Status:  reviewing
  enhancement                        |            Milestone:
                 Priority:  major    |           Resolution:
                Component:  data     |            Sensitive:  0
  source                             |  Add Hours to Ticket:  0
                 Keywords:           |          Total Hours:  0
Estimated Number of Hours:  0.0      |
                Billable?:  1        |
                Internal?:  0        |
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Comment (by jinmei):

 Replying to [comment:1 vorner]:
 > A went trough the documentation and tried to make it less confusing at
 places, fix factual errors and some language errors.
 >
 > I also changed the values of one enum to look more english.
 >
 > Is it what the task was about?
 >
 Basically, yes, thanks for picking up this one!

 I've added some more description and fixed trivial editorial issues as I
 reviewed your change.  There's one editorial point that may need a
 discussion: you seem to intentionally change "immutable" to "imutable",
 but I reverted the change.  According to several dictionaries I have, the
 former should be the correct spelling (or is this something about color vs
 colour?).

 And, I also modified the code logic (not just documentation): d0b73df

 Please check the changes I made, and if it's okay, feel free to merge the
 branch to master.

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Ticket URL: <http://bind10.isc.org/ticket/469#comment:2>
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