*: fix some misspellings spotted by GoReportCard

pkg/core/native/nativenames_test.go

@@ -15,5 +15,5 @@ func TestNativenamesIsValid(t *testing.T) {
 		require.True(t, nativenames.IsValid(c.Metadata().Name), fmt.Errorf("add %s to nativenames.IsValid(...)", c))
 	}
 
-	require.False(t, nativenames.IsValid("unkonwn"))
+	require.False(t, nativenames.IsValid("unknown"))
 }

pkg/rpc/client/native.go

@@ -1,6 +1,6 @@
 package client
 
-// Various non-policy things from native contracs.
+// Various non-policy things from native contracts.
 
 import (
 	"fmt"