Windows 10 issue with building docs

For some reason, sometimes running `yarn run docs` would throw these weird errors and fail to construct the doc. It seems like it has to do with `TypeScript`, perhaps from `ember-cli-typescript`. I was able to confirm that this was only happening on my windows 10 machine, but not my Mac.

```
D:\Coding\ember-test-helpers>yarn run docs
yarn run v1.13.0
$ scripts/precompile.sh && documentation build --document-exported "addon-test-support/@ember/test-helpers/index.js" --config documentation.yml -f md -o API.md && ember ts:clean
Done in 12.28s.

D:\Coding\ember-test-helpers>yarn run docs
yarn run v1.13.0
$ scripts/precompile.sh && documentation build --document-exported "addon-test-support/@ember/test-helpers/index.js" --config documentation.yml -f md -o API.md && ember ts:clean
Table of contents defined sorting of blur but no documentation with that namepath was found
Table of contents defined sorting of click but no documentation with that namepath was found
Table of contents defined sorting of doubleClick but no documentation with that namepath was found
Table of contents defined sorting of fillIn but no documentation with that namepath was found
Table of contents defined sorting of focus but no documentation with that namepath was found
Table of contents defined sorting of tap but no documentation with that namepath was found
Table of contents defined sorting of triggerEvent but no documentation with that namepath was found
Table of contents defined sorting of triggerKeyEvent but no documentation with that namepath was found
Table of contents defined sorting of typeIn but no documentation with that namepath was found
Table of contents defined sorting of find but no documentation with that namepath was found
Table of contents defined sorting of findAll but no documentation with that namepath was found
Table of contents defined sorting of getRootElement but no documentation with that namepath was found
Table of contents defined sorting of visit but no documentation with that namepath was found
Table of contents defined sorting of currentRouteName but no documentation with that namepath was found
Table of contents defined sorting of currentURL but no documentation with that namepath was found
Table of contents defined sorting of render but no documentation with that namepath was found
Table of contents defined sorting of clearRender but no documentation with that namepath was found
Table of contents defined sorting of waitFor but no documentation with that namepath was found
Table of contents defined sorting of waitUntil but no documentation with that namepath was found
Table of contents defined sorting of settled but no documentation with that namepath was found
Table of contents defined sorting of isSettled but no documentation with that namepath was found
Table of contents defined sorting of getSettledState but no documentation with that namepath was found
Table of contents defined sorting of pauseTest but no documentation with that namepath was found
Table of contents defined sorting of resumeTest but no documentation with that namepath was found
Table of contents defined sorting of getDebugInfo but no documentation with that namepath was found
Table of contents defined sorting of setResolver but no documentation with that namepath was found
Table of contents defined sorting of getResolver but no documentation with that namepath was found
Table of contents defined sorting of setupContext but no documentation with that namepath was found
Table of contents defined sorting of getContext but no documentation with that namepath was found
Table of contents defined sorting of setContext but no documentation with that namepath was found
Table of contents defined sorting of unsetContext but no documentation with that namepath was found
Table of contents defined sorting of teardownContext but no documentation with that namepath was found
Table of contents defined sorting of setupRenderingContext but no documentation with that namepath was found
Table of contents defined sorting of teardownRenderingContext but no documentation with that namepath was found
Table of contents defined sorting of getApplication but no documentation with that namepath was found
Table of contents defined sorting of setApplication but no documentation with that namepath was found
Table of contents defined sorting of setupApplicationContext but no documentation with that namepath was found
Table of contents defined sorting of teardownApplicationContext but no documentation with that namepath was found
Table of contents defined sorting of validateErrorHandler but no documentation with that namepath was found
Table of contents defined sorting of setupOnerror but no documentation with that namepath was found
Table of contents defined sorting of resetOnerror but no documentation with that namepath was found
WARNING: No TS precompilation manifest found; you may need to clean up extraneous files yourself.
Done in 11.68s.
```