[Docs] Add Documents for DataElements

[xinke-wang]

[codecov[bot]]

Codecov Report

Base: 83.59% // Head: 83.56% // Decreases project coverage by -0.03% :warning:

Coverage data is based on head (18a8d46) compared to base (50cba1a). Patch coverage: 100.00% of modified lines in pull request are covered.

:exclamation: Current head 18a8d46 differs from pull request most recent head e2e840e. Consider uploading reports for the commit e2e840e to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #1381      +/-   ##
===========================================
- Coverage    83.59%   83.56%   -0.04%     
===========================================
  Files          148      148              
  Lines         9709     9709              
  Branches      1414     1414              
===========================================
- Hits          8116     8113       -3     
- Misses        1355     1358       +3     
  Partials       238      238              

Flag	Coverage Δ
unittests	83.56% <100.00%> (-0.04%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmocr/structures/kie_data_sample.py	100.00% <ø> (ø)
mmocr/structures/textdet_data_sample.py	100.00% <ø> (ø)
mmocr/structures/textrecog_data_sample.py	100.00% <ø> (ø)
...r/evaluation/evaluator/multi_datasets_evaluator.py	92.30% <100.00%> (ø)
mmocr/datasets/transforms/textdet_transforms.py	90.47% <0.00%> (-1.33%)	:arrow_down:
.../models/textdet/postprocessors/db_postprocessor.py	93.15% <0.00%> (+2.73%)	:arrow_up:

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