Format/improve descriptions for Astro attributes

[VoxelMC]

Changes

• As I was perusing the code, I found some descriptions that might be improved/formatted. I hope this is an okay first PR!
  • I added periods to the end of every description, as some already had periods and the MDN editor docs also have periods at the end.

Testing

Tests pass, none added because this modifies previously added descriptions and no tests failed.

Docs

Formatting and aesthetic DX fix only.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: f8cd9e980ff2e10c9162d68a143ba5cf9bf1c43c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

| Name | Type | | ------------------------ | ----- | | @astrojs/language-server | Patch | | astro-vscode | Patch | | @astrojs/check | Patch |

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR