fix: minor typo

[toyboot4e]

Hi 👋 Fixes:

• master → main
• bread-first search → bradth-first search

Someone on Discord gave us this picture ha ha

[codecov]

Codecov Report

Merging #348 (eafc510) into main (5953a7b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #348   +/-   ##
=======================================
  Coverage   80.21%   80.21%           
=======================================
  Files         262      262           
  Lines       15667    15667           
=======================================
  Hits        12567    12567           
  Misses       3100     3100           

Impacted Files	Coverage Δ
crates/mun_hir/src/source_id.rs	73.80% <ø> (ø)

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