Improve documentation of the hex module

[jonasbb]

bors merge

[codecov]

Codecov Report

Merging #373 (d4516fa) into master (5d0f9b6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #373   +/-   ##
=======================================
  Coverage   77.23%   77.23%           
=======================================
  Files          47       47           
  Lines        2768     2768           
=======================================
  Hits         2138     2138           
  Misses        630      630           

Impacted Files	Coverage Δ
serde_with/src/hex.rs	76.92% <ø> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 5d0f9b6...d4516fa. Read the comment docs.

[jonasbb]

bors merge

[bors]

Build succeeded:

• Rustsec Audit
• Tests result