API clarifications

fix ad placement in certain situations

Update directives.md

- Explained the difference between v-component and v-view. This is highly confusing for people trying to learn the API for the first time!
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Update directives.md

Explained the imperative equivalent to v-component.

Update directives.md

Update directives.md

Spelling changes

Clarifications
Merge branch 'master' of https://github.com/TMiguelT/vuejs.org into squash
Merge pull request #2 from TMiguelT/squash

Squash