Documentation updates (same as #345)

[dongyoungy]

Basically same as #345, but with a few minor fixes.

[codecov-io]

Codecov Report

Merging #347 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #347   +/-   ##
======================================
  Coverage    70.8%   70.8%           
======================================
  Files         168     168           
  Lines       11492   11492           
  Branches     1874    1874           
======================================
  Hits         8136    8136           
+ Misses       2875    2874    -1     
- Partials      481     482    +1

Impacted Files	Coverage Δ
...org/verdictdb/sqlreader/ScrambleTableReplacer.java	80% <0%> (-2.22%)	:arrow_down:
...a/org/verdictdb/jdbc41/VerdictStreamResultSet.java	8.29% <0%> (-0.26%)	:arrow_down:
.../core/scrambling/FastConvergeScramblingMethod.java	91.91% <0%> (+0.58%)	:arrow_up:
...or/QueryResultAccuracyEstimatorFromDifference.java	84.16% <0%> (+1%)	:arrow_up:

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[dongyoungy]

This will resolve #346