Updated Pinot doc links

[xiangfu0]

Move doc link reference from https://apache-pinot.gitbook.io/apache-pinot-cookbook to https://docs.pinot.apache.org

[codecov-io]

Codecov Report

Merging #5193 into master will decrease coverage by 9.66%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #5193      +/-   ##
============================================
- Coverage     66.18%   56.51%   -9.67%     
  Complexity       12       12              
============================================
  Files          1052     1052              
  Lines         54170    54170              
  Branches       8078     8078              
============================================
- Hits          35851    30613    -5238     
- Misses        15679    21120    +5441     
+ Partials       2640     2437     -203     

Impacted Files	Coverage Δ	Complexity Δ
...a/org/apache/pinot/minion/metrics/MinionMeter.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (ø%)
.../apache/pinot/common/metrics/BrokerQueryPhase.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (ø%)
.../apache/pinot/minion/metrics/MinionQueryPhase.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (ø%)
...he/pinot/core/query/reduce/ComparisonFunction.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (ø%)
...pinot/minion/exception/TaskCancelledException.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (ø%)
...ot/minion/events/EventObserverFactoryRegistry.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (ø%)
...t/minion/executor/TaskExecutorFactoryRegistry.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (ø%)
...minion/executor/ConvertToRawIndexTaskExecutor.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (ø%)
...nion/events/DefaultMinionEventObserverFactory.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (ø%)
...startree/executor/StarTreeAggregationExecutor.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (ø%)
... and 322 more

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