Spelling mistakes corrected (#295)

app/src/main/java/net/ossrs/yasea/demo/MainActivity.java

@@ -131,10 +131,10 @@ public class MainActivity extends AppCompatActivity implements RtmpHandler.RtmpL
             @Override
             public void onClick(View v) {
                 if (btnSwitchEncoder.getText().toString().contentEquals("soft encoder")) {
-                    mPublisher.swithToSoftEncoder();
+                    mPublisher.switchToSoftEncoder();
                     btnSwitchEncoder.setText("hard encoder");
                 } else if (btnSwitchEncoder.getText().toString().contentEquals("hard encoder")) {
-                    mPublisher.swithToHardEncoder();
+                    mPublisher.switchToHardEncoder();
                     btnSwitchEncoder.setText("soft encoder");
                 }
             }

library/src/main/java/net/ossrs/yasea/SrsEncoder.java

@@ -52,7 +52,7 @@ public class SrsEncoder {
     private boolean networkWeakTriggered = false;
     private boolean mCameraFaceFront = true;
     private boolean useSoftEncoder = false;
-    private boolean canSoftEncoder = false;
+    private boolean canSoftEncode = false;
 
     private long mPresentTimeUs;