Update language to comply with Android's inclusive language guidance

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

Bug: 161896447
Test: m
Change-Id: I6c3c03c0c2d1302af6d5245486823c13a3432900

tests/net/java/com/android/server/ConnectivityServiceTest.java

@@ -4226,7 +4226,7 @@ public class ConnectivityServiceTest {
             callback.expectError(SocketKeepalive.ERROR_INVALID_IP_ADDRESS);
         }
 
-        // Sanity check before testing started keepalive.
+        // Basic check before testing started keepalive.
         try (SocketKeepalive ka = mCm.createSocketKeepalive(
                 myNet, testSocket, myIPv4, dstIPv4, executor, callback)) {
             ka.start(validKaInterval);