[pull] indonesian from master (#40)

* fix: fixed custom directives migration guide

* Update the GitHub repo link to `vue-next` (vuejs#672)

* Update introduction.md (vuejs#673)

* Improve formatting of teleport.md (vuejs#674)

This switches a link to using VideoLesson, which should make
it look a lot better. It also fixes a small punctuation typo.

* Fix a typo (vuejs#675)

* Add inject example to reactive section of docs (vuejs#677)

This example might come in handy for users that are yet to read on `Computed and Watch` in the documentation so they know that the properties they're making reactive using `computed` is available under `property.value` and not `property`.

* Fix: typo in global-api-treeshaking (vuejs#678)

* fix: increase header depth and tweak wording in transitions-overview.md (vuejs#679)

* fix: add two migration pages to the sidebar index (vuejs#680)

* fix: correct two examples of using h with components and slots (vuejs#681)

Co-authored-by: NataliaTepluhina <[email protected]>
Co-authored-by: YuLe <[email protected]>
Co-authored-by: Alexander Sokolov <[email protected]>
Co-authored-by: Aris Merchant <[email protected]>
Co-authored-by: Kid <[email protected]>
Co-authored-by: Timi Omoyeni <[email protected]>
Co-authored-by: Kushal Niroula <[email protected]>
Co-authored-by: skirtle <[email protected]>

Author: 9 people