MitsubishiAC: Fix code lint issue. (#1576)

* Fix a code linter warning.
* Improve documentation.
* Improve a unit test.

Ref #1572

src/ir_Mitsubishi.cpp

@@ -455,6 +455,7 @@ void IRMitsubishiAC::setMode(const uint8_t mode) {
 }
 
 /// Set the requested vane (Vertical Swing) operation mode of the a/c unit.
+/// @note On some models, this represents the Right vertical vane.
 /// @param[in] position The position/mode to set the vane to.
 void IRMitsubishiAC::setVane(const uint8_t position) {
   uint8_t pos = std::min(position, kMitsubishiAcVaneAutoMove);  // bounds check
@@ -469,6 +470,7 @@ void IRMitsubishiAC::setWideVane(const uint8_t position) {
 }
 
 /// Get the Vane (Vertical Swing) mode of the A/C.
+/// @note On some models, this represents the Right vertical vane.
 /// @return The native position/mode setting.
 uint8_t IRMitsubishiAC::getVane(void) const {
   return _.Vane;

src/ir_Mitsubishi.h

@@ -91,7 +91,7 @@ union Mitsubishi144Protocol{
     uint8_t          :8;
     // Byte 16
     uint8_t          :3;
-    uint8_t VaneLeft :3; // SwingV(Left)
+    uint8_t VaneLeft :3;  // SwingV(Left)
     uint8_t          :2;
     // Byte 17
     uint8_t Sum   :8;

test/ir_Mitsubishi_test.cpp

@@ -725,6 +725,7 @@ TEST(TestMitsubishiACClass, MessageConstuction) {
   EXPECT_EQ(kMitsubishiAcCool, ac.getMode());
   EXPECT_EQ(27, ac.getTemp());
   EXPECT_EQ(3, ac.getVane());
+  EXPECT_EQ(2, ac.getVaneLeft());
   EXPECT_TRUE(ac.getPower());
 
   irsend.reset();