docs: update fine grained device proposal

[jasonliu747]

Signed-off-by: Jason Liu jasonliu747@gmail.com

Ⅰ. Describe what this PR does

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

V. Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in make test

[codecov]

Codecov Report

Merging #531 (3a280f2) into main (a9fcfaf) will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #531      +/-   ##
==========================================
+ Coverage   67.17%   67.22%   +0.05%     
==========================================
  Files         160      160              
  Lines       16970    16970              
==========================================
+ Hits        11399    11408       +9     
+ Misses       4724     4715       -9     
  Partials      847      847              

Flag	Coverage Δ
unittests	67.22% <ø> (+0.05%)	⬆️

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

Impacted Files	Coverage Δ
pkg/koordlet/runtimehooks/reconciler/reconciler.go	81.05% <0.00%> (+9.47%)	⬆️

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