Revert "Merge pull request #4 from kiyo-masui/doc"

This reverts commit 2c4a775970034b9776c3b7e893ae101bcd0fcfa8, reversing
changes made to e6ece9f9022fa9ed7bd151c5d571e5bbe55a041b.
Merge pull request #6 from kiyo-masui/revert_merges

Revert "Merge pull request #4 from kiyo-masui/doc"