Fix the link to quanta::Clock::now to repair the docs

[sp1ff]

Trivial fix to repair rustdoc-generated documentation.

[antifuchs]

Ah, good catch! Thank you.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.61%. Comparing base (ab51c93) to head (0ee1a70).
⚠️ Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #288      +/-   ##
==========================================
+ Coverage   97.57%   97.61%   +0.04%     
==========================================
  Files          32       32              
  Lines        1977     1974       -3     
==========================================
- Hits         1929     1927       -2     
+ Misses         48       47       -1     

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