fix actix-service doc error

[Miloas]

PR Type

fix actix-service doc error

Other

PR Checklist

Check your PR fulfills the following:

• Tests for the changes have been added / updated.
• Documentation comments have been added / updated.
• A changelog entry has been made for the appropriate packages.
• Format code with the latest stable rustfmt

Overview

[codecov]

Codecov Report

Merging #172 into master will decrease coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #172      +/-   ##
==========================================
- Coverage   60.45%   60.37%   -0.09%     
==========================================
  Files          73       73              
  Lines        4785     4785              
==========================================
- Hits         2893     2889       -4     
- Misses       1892     1896       +4     

Impacted Files	Coverage Δ
actix-service/src/lib.rs	36.36% <ø> (ø)
actix-connect/tests/test_connect.rs	84.61% <0.00%> (-6.16%)	⬇️

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[robjtede]

Thanks 👍