Loïc Sharma 882bcbb9aa
[Doctor] Improve CocoaPods messages (#146701)
This tweaks the Flutter doctor messages for CocoaPods.

This also switches the "unknown version" error to link to the update instructions instead of the installation instructions; the user has already installed CocoaPods in this scenario.

Example error before:

```
    ✗ CocoaPods not installed.
        CocoaPods is used to retrieve the iOS and macOS platform side's plugin code that responds to your plugin usage on the Dart side.
        Without CocoaPods, plugins will not work on iOS or macOS.
        For more info, see https://flutter.dev/platform-plugins
      To install see https://guides.cocoapods.org/using/getting-started.html#installation for instructions.
```

Example error after:

```
    ✗ CocoaPods not installed.
        CocoaPods is a package manager for iOS or macOS platform code.
        Without CocoaPods, plugins will not work on iOS or macOS.
        For more info, see https://flutter.dev/platform-plugins
      For installation instructions, see https://guides.cocoapods.org/using/getting-started.html#installation
```
2024-04-15 18:45:12 +00:00
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