docs(react-native): fix app build.gradle react config default paths (f…

…acebook#44472)

Summary:
Minor inconvenience I noticed while doing some testing in a mono-repo.

The current paths points to the android folder, but should point to the project root. Currently the android build fails if one uncomments the folder paths as they are.

## Changelog:

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[ANDROID] [FIXED] - Fix incorrect paths in app build.gradle react config block

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[ANDROID] [FIXED] - Fix incorrect paths in app build.gradle react config block

Pull Request resolved: facebook#44472

Test Plan:
Uncomment the paths are they are and notice the android build error:
```
FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring project ':app'.
> Failed to notify project evaluation listener.
   > /xyz/xyz/xyz/xyz/RNPathTester/android/node_modules/react-native/ReactAndroid/gradle.properties (No such file or directory)
```

Use the updated paths and notice the build succeeds 🥳

Reviewed By: GijsWeterings

Differential Revision: D57093768

Pulled By: cipolleschi

fbshipit-source-id: 8472151c74c7aa5c51dc75f9adda6116387bdf99

packages/react-native/template/android/app/build.gradle

@@ -8,14 +8,14 @@ apply plugin: "com.facebook.react"
  */
 react {
     /* Folders */
-    //   The root of your project, i.e. where "package.json" lives. Default is '..'
-    // root = file("../")
-    //   The folder where the react-native NPM package is. Default is ../node_modules/react-native
-    // reactNativeDir = file("../node_modules/react-native")
-    //   The folder where the react-native Codegen package is. Default is ../node_modules/@react-native/codegen
-    // codegenDir = file("../node_modules/@react-native/codegen")
-    //   The cli.js file which is the React Native CLI entrypoint. Default is ../node_modules/react-native/cli.js
-    // cliFile = file("../node_modules/react-native/cli.js")
+    //   The root of your project, i.e. where "package.json" lives. Default is '../..'
+    // root = file("../../")
+    //   The folder where the react-native NPM package is. Default is ../../node_modules/react-native
+    // reactNativeDir = file("../../node_modules/react-native")
+    //   The folder where the react-native Codegen package is. Default is ../../node_modules/@react-native/codegen
+    // codegenDir = file("../../node_modules/@react-native/codegen")
+    //   The cli.js file which is the React Native CLI entrypoint. Default is ../../node_modules/react-native/cli.js
+    // cliFile = file("../../node_modules/react-native/cli.js")
 
     /* Variants */
     //   The list of variants to that are debuggable. For those we're going to