Web Font: Fix ascent/descent-override property typo

[t-hamano]

Fix: #44919

What?

This PR fixes a typo in the ascender/descender definition of the font.

• ascent-override - CSS: Cascading Style Sheets | MDN
• descent-override - CSS: Cascading Style Sheets | MDN

How?

I searched the repository and corrected all areas that were typos.

Testing Instructions

In TT3's theme.json, change the fontFace property as follows:

			"fontFamilies": [
				{
					"fontFace": [
						{
							"fontFamily": "DM Sans",
							"fontStretch": "normal",
							"fontStyle": "normal",
							"fontWeight": "400",
							"src": [
								"file:./assets/fonts/dm-sans/DMSans-Regular.woff2"
							],
							"ascentOverride": "300%"
						},
						{
							"fontFamily": "DM Sans",
							"fontStretch": "normal",
							"fontStyle": "italic",
							"fontWeight": "400",
							"src": [
								"file:./assets/fonts/dm-sans/DMSans-Regular-Italic.woff2"
							],
							"descentOverride": "300%"
						},
						...
					]
				}
				...
			]

In webfonts-inline-css, check that the font-face property is output correctly.

Screenshots or screencast

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[Mamaduka]

Thank you, @t-hamano!