Update flash_zero.rst

[williamFalcon]

updates flash zero doc...

WARNING: this is just an outline... the code needs to actually be correct

[codecov]

Codecov Report

Merging #796 (4c51fff) into master (fc7c9e1) will increase coverage by 9.19%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #796      +/-   ##
==========================================
+ Coverage   79.67%   88.87%   +9.19%     
==========================================
  Files         217      217              
  Lines       11623    11623              
==========================================
+ Hits         9261    10330    +1069     
+ Misses       2362     1293    -1069     

Flag	Coverage Δ
unittests	88.87% <ø> (+9.19%)	⬆️

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

Impacted Files	Coverage Δ
flash/video/classification/data.py	74.54% <0.00%> (-8.19%)	⬇️
flash/core/data/transforms.py	97.01% <0.00%> (+1.49%)	⬆️
...ash/image/classification/integrations/baal/data.py	40.86% <0.00%> (+2.15%)	⬆️
flash/image/classification/model.py	76.59% <0.00%> (+4.25%)	⬆️
.../image/classification/integrations/baal/dropout.py	45.00% <0.00%> (+5.00%)	⬆️
flash/pointcloud/segmentation/open3d_ml/app.py	33.33% <0.00%> (+5.88%)	⬆️
flash/pointcloud/detection/datasets.py	62.50% <0.00%> (+6.25%)	⬆️
flash/core/data/data_source.py	94.71% <0.00%> (+6.27%)	⬆️
flash/image/data.py	86.66% <0.00%> (+8.00%)	⬆️
flash/image/segmentation/data.py	89.70% <0.00%> (+8.82%)	⬆️
... and 43 more

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