Fix typo in README: correct signing certificate verification link

Author: RamsaiPolisetti

README.md

@@ -16,7 +16,7 @@ height="80">](https://f-droid.org/packages/com.nextcloud.client/)
 alt="Get it with Obtainium"
 height="80">](https://apps.obtainium.imranr.dev/redirect?r=obtainium://app/%7B%22id%22%3A%22com.nextcloud.client%22%2C%22url%22%3A%22https%3A%2F%2Fgithub.com%2Fnextcloud%2Fandroid%22%2C%22author%22%3A%22nextcloud%22%2C%22name%22%3A%22Nextcloud%22%2C%22preferredApkIndex%22%3A0%2C%22additionalSettings%22%3A%22%7B%5C%22includePrereleases%5C%22%3Afalse%2C%5C%22fallbackToOlderReleases%5C%22%3Atrue%2C%5C%22filterReleaseTitlesByRegEx%5C%22%3A%5C%22%5C%22%2C%5C%22filterReleaseNotesByRegEx%5C%22%3A%5C%22%5C%22%2C%5C%22verifyLatestTag%5C%22%3Afalse%2C%5C%22sortMethodChoice%5C%22%3A%5C%22date%5C%22%2C%5C%22useLatestAssetDateAsReleaseDate%5C%22%3Afalse%2C%5C%22releaseTitleAsVersion%5C%22%3Afalse%2C%5C%22trackOnly%5C%22%3Afalse%2C%5C%22versionExtractionRegEx%5C%22%3A%5C%22%5C%22%2C%5C%22matchGroupToUse%5C%22%3A%5C%22%5C%22%2C%5C%22versionDetection%5C%22%3Atrue%2C%5C%22releaseDateAsVersion%5C%22%3Afalse%2C%5C%22useVersionCodeAsOSVersion%5C%22%3Afalse%2C%5C%22apkFilterRegEx%5C%22%3A%5C%22%5Enextcloud.*%5C%22%2C%5C%22invertAPKFilter%5C%22%3Afalse%2C%5C%22autoApkFilterByArch%5C%22%3Atrue%2C%5C%22appName%5C%22%3A%5C%22%5C%22%2C%5C%22appAuthor%5C%22%3A%5C%22%5C%22%2C%5C%22shizukuPretendToBeGooglePlay%5C%22%3Afalse%2C%5C%22allowInsecure%5C%22%3Afalse%2C%5C%22exemptFromBackgroundUpdates%5C%22%3Afalse%2C%5C%22skipUpdateNotifications%5C%22%3Afalse%2C%5C%22about%5C%22%3A%5C%22Nextcloud%20ist%20eine%20Cloudanwendung%2C%20die%20selbst%20gehostet%20werden%20kann.%5C%22%2C%5C%22refreshBeforeDownload%5C%22%3Atrue%7D%22%2C%22overrideSource%22%3Anull%7D)
 
-Signing certificate fingerprint to [verify](https://developer.android.com/studio/command-line/apksigner#usage-verify) the APK:
+Signing certificate fingerprint to [verify](https://developer.android.com/studio/command-line/apksigner#usage-verify) the APK using the official Android documentation.
 - APK with "gplay" name, found [here](https://github.com/nextcloud/android/releases) or distributed via Google Play Store
 - APK with "nextcloud", found [here](https://github.com/nextcloud/android/releases)
 - not suitable for Fdroid downloads, as Fdroid is signing it on their own