Update TextTheme with the M3 Typography tokens (#153131)

This PR adds a new table with[ Material 3 typography tokens](https://m3.material.io/styles/typography/type-scale-tokens).

Issue:
flutter/flutter#148429

Author: RamonFarizel

packages/flutter/lib/src/material/text_theme.dart

@@ -35,14 +35,36 @@ import 'typography.dart';
 /// current (2021) version of the specification
 /// ([https://m3.material.io/styles/typography/tokens](https://m3.material.io/styles/typography/tokens)).
 ///
+/// The **2021** spec has fifteen text styles:
+///
+/// | NAME           | SIZE |  HEIGHT |  WEIGHT |  SPACING |             |
+/// |----------------|------|---------|---------|----------|-------------|
+/// | displayLarge   | 57.0 |   64.0  | regular | -0.25    |             |
+/// | displayMedium  | 45.0 |   52.0  | regular |  0.0     |             |
+/// | displaySmall   | 36.0 |   44.0  | regular |  0.0     |             |
+/// | headlineLarge  | 32.0 |   40.0  | regular |  0.0     |             |
+/// | headlineMedium | 28.0 |   36.0  | regular |  0.0     |             |
+/// | headlineSmall  | 24.0 |   32.0  | regular |  0.0     |             |
+/// | titleLarge     | 22.0 |   28.0  | regular |  0.0     |             |
+/// | titleMedium    | 16.0 |   24.0  | medium  |  0.15    |             |
+/// | titleSmall     | 14.0 |   20.0  | medium  |  0.1     |             |
+/// | bodyLarge      | 16.0 |   24.0  | regular |  0.5     |             |
+/// | bodyMedium     | 14.0 |   20.0  | regular |  0.25    |             |
+/// | bodySmall      | 12.0 |   16.0  | regular |  0.4     |             |
+/// | labelLarge     | 14.0 |   20.0  | medium  |  0.1     |             |
+/// | labelMedium    | 12.0 |   16.0  | medium  |  0.5     |             |
+/// | labelSmall     | 11.0 |   16.0  | medium  |  0.5     |             |
+///
+/// ...where "regular" is `FontWeight.w400` and "medium" is `FontWeight.w500`.
+///
 /// The names of the 2018 TextTheme properties match this table from the
 /// [Material Design spec](https://material.io/design/typography/the-type-system.html#type-scale)
 /// with a few exceptions: the styles called H1-H6 in the spec are
 /// displayLarge-titleLarge in the API chart, body1,body2 are called
 /// bodyLarge and bodyMedium, caption is now bodySmall, button is labelLarge,
 /// and overline is now labelSmall.
 ///
-/// The 2018 spec has thirteen text styles:
+/// The **2018** spec has thirteen text styles:
 ///
 /// | NAME           | SIZE |  WEIGHT |  SPACING |             |
 /// |----------------|------|---------|----------|-------------|