fix: mobile docs.rs builds

.changes/docs-rs-android-build.md

@@ -0,0 +1,22 @@
+---
+"barcode-scanner": patch
+"barcode-scanner-js": patch
+"biometric": patch
+"biometric-js": patch
+"clipboard-manager": patch
+"clipboard-manager-js": patch
+"deep-link": patch
+"deep-link-js": patch
+"dialog": patch
+"dialog-js": patch
+"geolocation": patch
+"geolocation-js": patch
+"haptics": patch
+"haptics-js": patch
+"nfc": patch
+"nfc-js": patch
+"notification": patch
+"notification-js": patch
+---
+
+Fix the docs.rs build for Android: the build script now detects docs.rs through the `DOCS_RS` environment variable, since `cfg(docsrs)` is never set for build scripts.