[Docs] Chinese Document of 2_new_data_model

[wHao-Wu]

• Add Chinese Document of 2_new_data_model
• Fix a typo error of English Document of 2_new_data_model

[codecov]

Codecov Report

Merging #729 (b82e224) into master (2f95eb7) will increase coverage by 0.41%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #729      +/-   ##
==========================================
+ Coverage   48.91%   49.33%   +0.41%     
==========================================
  Files         208      210       +2     
  Lines       15866    16021     +155     
  Branches     2546     2556      +10     
==========================================
+ Hits         7761     7904     +143     
- Misses       7609     7614       +5     
- Partials      496      503       +7     

Flag	Coverage Δ
unittests	49.33% <ø> (+0.41%)	⬆️

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

Impacted Files	Coverage Δ
mmdet3d/models/detectors/single_stage.py	58.62% <0.00%> (-17.57%)	⬇️
mmdet3d/core/bbox/structures/utils.py	80.51% <0.00%> (-16.63%)	⬇️
mmdet3d/datasets/scannet_dataset.py	78.51% <0.00%> (-9.34%)	⬇️
mmdet3d/datasets/s3dis_dataset.py	88.57% <0.00%> (-6.10%)	⬇️
mmdet3d/datasets/nuscenes_mono_dataset.py	37.08% <0.00%> (-1.03%)	⬇️
mmdet3d/apis/inference.py	43.21% <0.00%> (-0.85%)	⬇️
mmdet3d/models/fusion_layers/point_fusion.py	64.44% <0.00%> (-0.78%)	⬇️
mmdet3d/datasets/pipelines/transforms_3d.py	90.46% <0.00%> (-0.40%)	⬇️
mmdet3d/models/dense_heads/centerpoint_head.py	44.55% <0.00%> (-0.19%)	⬇️
mmdet3d/datasets/kitti_mono_dataset.py	63.98% <0.00%> (-0.16%)	⬇️
... and 165 more

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[wHao-Wu]

Need more reviews on the description of KITTI data format.