chore: add additional docs about root call gas limit

[mattsse]

ref #4262

#3678

[codecov]

Codecov Report

Merging #4292 (0991e7e) into main (7f9116b) will decrease coverage by 0.01%.
Report is 4 commits behind head on main.
The diff coverage is 0.00%.

Files Changed	Coverage Δ
crates/revm/revm-inspectors/src/tracing/mod.rs	0.00% <0.00%> (ø)

... and 7 files with indirect coverage changes

Flag	Coverage Δ
integration-tests	16.87% <0.00%> (-0.01%)	⬇️
unit-tests	63.77% <0.00%> (-0.01%)	⬇️

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

Components	Coverage Δ
reth binary	26.12% <ø> (ø)
blockchain tree	82.56% <ø> (ø)
pipeline	90.07% <ø> (ø)
storage (db)	74.77% <ø> (ø)
trie	94.81% <ø> (-0.04%)	⬇️
txpool	49.10% <ø> (ø)
networking	77.44% <ø> (-0.02%)	⬇️
rpc	58.70% <ø> (-0.06%)	⬇️
consensus	63.53% <ø> (ø)
revm	32.02% <0.00%> (-0.02%)	⬇️
payload builder	6.82% <ø> (ø)
primitives	85.99% <ø> (+0.04%)	⬆️