Fix typo in target loadd addon

[boshek]

Summary

evironmetn should actually be environment

Checklist

• [x] I understand and agree to the code of conduct.
• [ ] ~I have listed any substantial changes in the development news.~
• [ ] ~I have added testthat unit tests to tests/testthat for any new functionality.~
• [x] This pull request is not a draft.

[codecov-io]

Codecov Report

Merging #1330 into master will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master     #1330   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           51        51           
  Lines         8339      8339           
=========================================
  Hits          8339      8339           

Impacted Files	Coverage Δ
R/rstudio.R	100.00% <100.00%> (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 7f1f5d5...8be46c0. Read the comment docs.

[wlandau]

Thanks!