Update language to comply with Android’s inclusive language guidance

See https://source.android.com/setup/contribute/respectful-code for
reference

Bug: 161896447
Bug: 161850439
Bug: 161336379
Test: m -j checkbuild cts docs tests
Change-Id: I32d869c274a5d9a3dac63221e25874fe685d38c4
diff --git a/libnativebridge/tests/PreInitializeNativeBridge_test.cpp b/libnativebridge/tests/PreInitializeNativeBridge_test.cpp
index cd5a8e2..149b05e 100644
--- a/libnativebridge/tests/PreInitializeNativeBridge_test.cpp
+++ b/libnativebridge/tests/PreInitializeNativeBridge_test.cpp
@@ -38,7 +38,7 @@
 
     // Try to create our mount namespace.
     if (unshare(CLONE_NEWNS) != -1) {
-        // Create a dummy file.
+        // Create a placeholder file.
         FILE* cpuinfo = fopen("./cpuinfo", "w");
         ASSERT_NE(nullptr, cpuinfo) << strerror(errno);
         fprintf(cpuinfo, kTestData);