chore: update android signing fingerprints to docs (#23361)

* Update mobile-app.mdx

Add certificate fingerprint for android releases.

* chore: formatting

* Chore: Typo

---------

Co-authored-by: Daniel Dietzler <mail@ddietzler.dev>

docs/docs/features/mobile-app.mdx

@@ -10,6 +10,16 @@ import MobileAppBackup from '/docs/partials/_mobile-app-backup.md';
 
 <MobileAppDownload />
 
+:::info Android verification
+Below are the SHA-256 fingerprints for the certificates signing the android applications.
+
+- Playstore / Github releases:
+  `86:C5:C4:55:DF:AF:49:85:92:3A:8F:35:AD:B3:1D:0C:9E:0B:95:7D:7F:94:C2:D2:AF:6A:24:38:AA:96:00:20`
+- F-Droid releases:
+  `FA:8B:43:95:F4:A6:47:71:A0:53:D1:C7:57:73:5F:A2:30:13:74:F5:3D:58:0D:D1:75:AA:F7:A1:35:72:9C:BF`
+
+:::
+
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