Fix test build type in proguard config documentation

[erksch]

Description

I followed the guide on proguard configuration and noticed an issue in the docs where the testBuildType parameter is not correct.

It is

{
  apps: {
     'android.release': {
       type: 'android.apk',
-      binaryPath: 'android/app/build/outputs/apk/release/app-release.apk',
+      binaryPath: 'android/app/build/outputs/apk/releaseE2E/app-releaseE2E.apk',
-      build: 'cd android && ./gradlew assembleRelease assembleAndroidTest -DtestBuildType=release'
+      build: 'cd android && ./gradlew assembleReleaseE2E assembleAndroidTest -DtestBuildType=release'
     },`

but should be

{
  apps: {
     'android.release': {
       type: 'android.apk',
-      binaryPath: 'android/app/build/outputs/apk/release/app-release.apk',
+      binaryPath: 'android/app/build/outputs/apk/releaseE2E/app-releaseE2E.apk',
-      build: 'cd android && ./gradlew assembleRelease assembleAndroidTest -DtestBuildType=releaseE2E'
+      build: 'cd android && ./gradlew assembleReleaseE2E assembleAndroidTest -DtestBuildType=releaseE2E'
     },`

Otherwise the android test APK for the releaseE2E variant is not created.

You can see that others already use this for example here: #3711

For features/enhancements:

• I have added/updated the relevant references in the documentation files.