Fix XML examples that should use actual strings, not constant references

[pnc]

It goes without saying that the XML files cannot use the Java constants for these strings.

The example projects were fixed in https://github.com/opencabstandard/opencab/commit/8126a2288ce602881b683f7dc02186026acfff28

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Name	Status	Preview	Comments	Updated (UTC)
opencab	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 7, 2023 1:32pm

[pnc]

I tend to think the example should now include

<action android:name="org.opencabstandard.ACTION_IDENTITY_INFORMATION_CHANGED" />

too for completeness.

[pnc]

cc @sebastian-valentin who I finally added to maintainers list.