Update `ColorScheme.light`, `ColorScheme.dark`, `ColorScheme.highContrastLight`, & `ColorScheme.highContrastDark`  constructors docs for Material 3 (#137149)

fixes [Clarify ColorScheme fromSwatch/fromSeed usage](https://github.com/flutter/flutter/issues/132584)

"This explains how to use `ColorScheme.fromSeed` as a substitute for each `ColorScheme` constructor."

| `ColorScheme.light` (left) to `ColorScheme.fromSeed` (right) | 
| --------------- | 
| ![light](https://github.com/flutter/flutter/assets/48603081/e056e723-5640-4b05-8feb-ca6b517c8682)	|

| `ColorScheme.dark` (left) to `ColorScheme.fromSeed` (right) | 
| --------------- | 
| ![dark](https://github.com/flutter/flutter/assets/48603081/5ff32611-bfb6-49ee-a34e-f935f580e84e)	|

| `ColorScheme.highContrastLight` (left) to `ColorScheme.fromSeed` (right) | 
| --------------- | 
| ![highContrastLight](https://github.com/flutter/flutter/assets/48603081/4b47f2e3-ea8e-4148-85cc-69690e9082c7) |

| `ColorScheme.highContrastDark` (left) to `ColorScheme.fromSeed` (right) | 
| --------------- | 
| ![highContrastDark](https://github.com/flutter/flutter/assets/48603081/3dbd7ec4-c78e-4228-a8ed-673832681563) |