Clarify Input docs about removing spacing

[TomJGooding]

The Input docs includes a Additional Notes section about removing the spacing:

textual/docs/widgets/input.md

Lines 156 to 158 in b28ad50

	## Additional Notes
	* The spacing around the text content is due to border. To remove it, set `border: none;` in your CSS.

But the default CSS also has a height and a padding, so I think perhaps this is misleading. It also doesn't mention the :focus state which is likely to catch some people out.

textual/src/textual/widgets/_input.py

Lines 141 to 149 in b28ad50

	DEFAULT_CSS = """
	Input {
	background: $boost;
	color: $text;
	padding: 0 2;
	border: tall $background;
	width: 100%;
	height: 3;
	}

[github-actions]

Thank you for your issue. Give us a little time to review it.

PS. You might want to check the FAQ if you haven't done so already.

This is an automated reply, generated by FAQtory

[github-actions]

Don't forget to star the repository!

Follow @textualizeio for Textual updates.