Polish a few words. (#371)
Polish a few words. (#371)

* Minor typos fixes.

* Dup character.

* Remove extra character.

* Fix one character.

* Polish a few words.

* reverse word change

mli/gluon-tutorials-zh,mli/gluon-tutorials-zh,mli/gluon-tutorials-zh,mli/gluon-tutorials-zh,d2l-ai/d2l-zh,d2l-ai/d2l-zh,d2l-ai/d2l-zh