Fix documentation warning for abc metric

[Luni-4]

This PR fixes this documentation warning for abc metric

20 | /// https://www.softwarerenovation.com/Articles.aspx
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use an automatic link instead: `<https://www.softwarerenovation.com/Articles.aspx>`
   |
   = note: bare URLs are not automatically turned into clickable links
   = note: `#[warn(rustdoc::bare_urls)]` on by default

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.01 ⚠️

Comparison is base (d360076) 74.19% compared to head (2f8012c) 74.18%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1035      +/-   ##
==========================================
- Coverage   74.19%   74.18%   -0.01%     
==========================================
  Files          64       64              
  Lines       15923    15923              
==========================================
- Hits        11814    11813       -1     
- Misses       4109     4110       +1     

Impacted Files	Coverage Δ
src/metrics/abc.rs	94.37% <ø> (ø)

... and 1 file with indirect coverage changes

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