docs: clarify that all sync participants must share the same schema #713

Job	Run time
postgresql15-macos-arm64 build	33s
postgresql17-linux-x86_64 build	33s
postgresql 15 build + test	1m 32s
postgresql15-linux-x86_64 build	24s
postgresql17-linux-arm64 build	44s
postgresql17-macos-arm64 build	22s
postgresql15-linux-arm64 build	39s
postgresql15-macos-x86_64 build	23s
postgresql 17 build + test	1m 30s
postgresql17-macos-x86_64 build	23s
linux-musl-arm64 build + test	4m 40s
linux-musl-x86_64 build + test	1m 35s
linux-x86_64 build + test	1m 41s
macos-x86_64 build	1m 56s
macos-arm64 build + test	2m 18s
ios build	1m 19s
android-arm64-v8a build	2m 16s
android-x86_64 build + test	7m 48s
android-armeabi-v7a build	2m 26s
ios-sim build	1m 30s
windows-x86_64 build + test	8m 18s
linux-arm64 build + test	5m 14s
macos build + test	2m 52s
android-aar build	7m 29s
apple-xcframework build	3m 16s
release	18s
docker sqlite-sync-supabase pg17	4m 35s
docker sqlite-sync-postgres pg17	2m 52s
docker sqlite-sync-supabase pg15	2m 13s
docker sqlite-sync-postgres pg15	2m 53s
	1h 14m 32s

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