chore: adding doc to lib

[Freyskeyd]

Description

Adding some documentation about the topos-tce-broadcast crate

PR Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added or updated tests that comprehensively prove my change is effective or that my feature works

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (ef02f04) 60.73% compared to head (16cb576) 60.77%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #342      +/-   ##
==========================================
+ Coverage   60.73%   60.77%   +0.04%     
==========================================
  Files         232      232              
  Lines       12135    12133       -2     
==========================================
+ Hits         7370     7374       +4     
+ Misses       4765     4759       -6     

Files	Coverage Δ
crates/topos-tce-broadcast/src/lib.rs	86.66% <ø> (+1.14%)	⬆️
crates/topos-tce-broadcast/src/sampler/mod.rs	100.00% <ø> (+12.50%)	⬆️

... and 1 file with indirect coverage changes

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[dvdplm]

Yes please!

[hadjiszs]

also several occurrences of broadcasted where broadcast seems better.