Fix typos in comments

Author: per1234

examples/RTU/ModbusRTUClientKitchenSink/ModbusRTUClientKitchenSink.ino

@@ -1,7 +1,7 @@
 /*
   Modbus RTU Client Kitchen Sink
 
-  This sketch creates a Modbus RTU Client and demostrates
+  This sketch creates a Modbus RTU Client and demonstrates
   how to use various Modbus Client APIs.
 
   Circuit:
@@ -164,7 +164,7 @@ void readHoldingRegisterValues() {
 void readInputRegisterValues() {
   Serial.print("Reading input register values ... ");
 
-  // read 10 dsicrete input values from (slave) id 42,
+  // read 10 discrete input values from (slave) id 42,
   if (!ModbusRTUClient.requestFrom(42, INPUT_REGISTERS, 0x00, 10)) {
     Serial.print("failed! ");
     Serial.println(ModbusRTUClient.lastError());
@@ -181,4 +181,3 @@ void readInputRegisterValues() {
   // Alternatively, to read a single Input Register value use:
   // ModbusRTUClient.inputRegisterRead(...)
 }
-

examples/RTU/ModbusRTUServerKitchenSink/ModbusRTUServerKitchenSink.ino

@@ -1,7 +1,7 @@
 /*
   Modbus RTU Server Kitchen Sink
 
-  This sketch creates a Modbus RTU Server and demostrates
+  This sketch creates a Modbus RTU Server and demonstrates
   how to use various Modbus Server APIs.
 
   Circuit:
@@ -62,7 +62,7 @@ void loop() {
     ModbusRTUServer.discreteInputWrite(i, coilValue);
   }
 
-  // map the holiding register values to the input register values
+  // map the holding register values to the input register values
   for (int i = 0; i < numHoldingRegisters; i++) {
     long holdingRegisterValue = ModbusRTUServer.holdingRegisterRead(i);
 

examples/RTU/ModbusRTUServerLED/ModbusRTUServerLED.ino

@@ -53,7 +53,7 @@ void loop() {
     // coil value set, turn LED on
     digitalWrite(ledPin, HIGH);
   } else {
-    // coild value clear, turn LED off
+    // coil value clear, turn LED off
     digitalWrite(ledPin, LOW);
   }
 }

examples/RTU/ModbusRTUTemperatureSensor/ModbusRTUTemperatureSensor.ino

@@ -1,5 +1,5 @@
 /*
-  Modbus RTU Temeperature Sensor
+  Modbus RTU Temperature Sensor
 
   This sketch shows you how to interact with a Modbus RTU temperature and humidity sensor.
   It reads the temperature and humidity values every 5 seconds and outputs them to the

examples/TCP/WiFiModbusClientToggle/WiFiModbusClientToggle.ino

@@ -40,7 +40,7 @@ void setup() {
 
   Serial.println("Modbus TCP Client Toggle");
 
-  // attempt to connect to Wifi network:
+  // attempt to connect to WiFi network:
   while (status != WL_CONNECTED) {
     Serial.print("Attempting to connect to SSID: ");
     Serial.println(ssid);

examples/TCP/WiFiModbusServerLED/WiFiModbusServerLED.ino

@@ -41,7 +41,7 @@ void setup() {
 
   Serial.println("Modbus TCP Server LED");
 
-  // attempt to connect to Wifi network:
+  // attempt to connect to WiFi network:
   while (status != WL_CONNECTED) {
     Serial.print("Attempting to connect to SSID: ");
     Serial.println(ssid);

src/ModbusClient.h

@@ -65,7 +65,7 @@ class ModbusClient {
    * @param id (slave) id of target, defaults to 0x00 if not specified
    * @param address start address to use for operation
    *
-   * @return holiding register value on success, -1 on failure.
+   * @return holding register value on success, -1 on failure.
    */
   long holdingRegisterRead(int address);
   long holdingRegisterRead(int id, int address);