[MINOR] Docs: remove incubator words
[MINOR] Docs: remove incubator words

- Docs: remove incubator words

Author: Hao Chen <hchen9@ebay.com>

Closes #967 from haoch/removeIncubatorWords.

haoch/incubator-eagle,1haodian/eagle,haoch/incubator-eagle,haoch/incubator-eagle,yonzhang/incubator-eagle,yonzhang/incubator-eagle,haoch/incubator-eagle,yonzhang/incubator-eagle,1haodian/eagle,haoch/incubator-eagle,haoch/Eagle,haoch/incubator-eagle,yonzhang/incubator-eagle,1haodian/eagle,haoch/Eagle,yonzhang/incubator-eagle,haoch/Eagle,haoch/Eagle,1haodian/eagle,1haodian/eagle,haoch/Eagle