Brian J King dbd56999c9 Standardize the documentation index page (#5427)
Updates to the [documentation index page](https://www.home-assistant.io/developers/documentation/) to fix some typos & more in line with the [documentation standards](https://www.home-assistant.io/developers/documentation/standards/). 

* Shortcut not *short cut*
* Capitalize Markdown as it's not `markdown`
* When referencing a Pull Request it is always referred to as `Pull Request (PR)`
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