Removing remaining project references to 'incubator'

[jthomas]

Found a few other doc references to "incubator/incubation".

[codecov-io]

Codecov Report

Merging #190 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #190   +/-   ##
=======================================
  Coverage   99.27%   99.27%           
=======================================
  Files          14       14           
  Lines         411      411           
=======================================
  Hits          408      408           
  Misses          3        3

---

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.27%. Comparing base (d03406c) to head (7a71028). Report is 58 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #190 +/- ## ======================================= Coverage 99.27% 99.27% ======================================= Files 14 14 Lines 411 411 ======================================= Hits 408 408 Misses 3 3 ```

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