Correct typos in comments and documentation

Author: per1234

examples/GetTwitterStatus/GetTwitterStatus.ino

@@ -1,5 +1,5 @@
 /*
-  Get twitter status
+  Get Twitter status
 
   This example shows a REST API GET using OAuth 1.0
   authentication. It then parses the JSON response.
@@ -33,7 +33,7 @@ const char consumerKeySecret[] = SECRET_CONSUMER_KEY_SECRET;
 const char accessToken[]       = SECRET_ACCESS_TOKEN;
 const char accessTokenSecret[] = SECRET_ACCESS_TOKEN_SECRET;
 
-int status = WL_IDLE_STATUS;     // the Wifi radio's status
+int status = WL_IDLE_STATUS;     // the WiFi radio's status
 
 WiFiSSLClient wifiSSLClient;
 OAuthClient oauthClient(wifiSSLClient, "api.twitter.com", 443);
@@ -54,7 +54,7 @@ void setup() {
     while (true);
   }
 
-  // attempt to connect to Wifi network:
+  // attempt to connect to WiFi network:
   while (status != WL_CONNECTED) {
     Serial.print("Attempting to connect to WPA SSID: ");
     Serial.println(ssid);

examples/Tweeter/Tweeter.ino

@@ -2,7 +2,7 @@
   Tweeter
 
   This sketch demonstrates how to post a Tweet directly to
-  Twitter via the Twitter's HTTP API using OAuth 1.0 for authenticaion.
+  Twitter via the Twitter's HTTP API using OAuth 1.0 for authentication.
 
   OAuth credentials can be retrieved from the following
   website, using your Twitter account and creating a new
@@ -32,7 +32,7 @@ const char consumerKeySecret[] = SECRET_CONSUMER_KEY_SECRET;
 const char accessToken[]       = SECRET_ACCESS_TOKEN;
 const char accessTokenSecret[] = SECRET_ACCESS_TOKEN_SECRET;
 
-int status = WL_IDLE_STATUS;     // the Wifi radio's status
+int status = WL_IDLE_STATUS;     // the WiFi radio's status
 
 WiFiSSLClient wifiSSLClient;
 OAuthClient oauthClient(wifiSSLClient, "api.twitter.com", 443);
@@ -51,7 +51,7 @@ void setup() {
     while (true);
   }
 
-  // attempt to connect to Wifi network:
+  // attempt to connect to WiFi network:
   while (status != WL_CONNECTED) {
     Serial.print("Attempting to connect to WPA SSID: ");
     Serial.println(ssid);

src/OAuthClient.cpp

@@ -265,7 +265,7 @@ String OAuthClient::calculateSignature(const char* method, const char* url, unsi
 {
   // This function is long due to the complexity of the OAuth signature.
   // It must collect all the parameters from the oauth, query, and body params,
-  // then sort the param key values lexographically. After these steps the 
+  // then sort the param key values lexicographically. After these steps the 
   // signature can be calculated.
 
   // calculate the OAuth params