docs: update FirstCompactShareSequenceLengthBytes

[rootulp]

Update godoc comment for FirstCompactShareSequenceLengthBytes to account for #850

[codecov-commenter]

Codecov Report

Merging #1107 (4572b86) into main (2b7aa83) will increase coverage by 0.06%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##             main    #1107      +/-   ##
==========================================
+ Coverage   50.48%   50.55%   +0.06%     
==========================================
  Files          72       72              
  Lines        4306     4312       +6     
==========================================
+ Hits         2174     2180       +6     
  Misses       1917     1917              
  Partials      215      215              

Impacted Files	Coverage Δ
x/blob/types/params.go	33.33% <0.00%> (ø)
app/estimate_square_size.go	89.76% <50.00%> (ø)
pkg/da/data_availability_header.go	79.64% <100.00%> (ø)
x/blob/types/payforblob.go	72.54% <100.00%> (+1.71%)	⬆️

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