fix doc of HipStr::borrowed

[polazarus]

fixes #28

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.81%. Comparing base (935df13) to head (013f7fd).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #29   +/-   ##
=======================================
  Coverage   99.81%   99.81%           
=======================================
  Files          24       24           
  Lines        3331     3331           
  Branches     3331     3331           
=======================================
  Hits         3325     3325           
  Misses          1        1           
  Partials        5        5           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.