Fix length typo (espressif#5189)

Author: atotto

cores/esp32/WString.cpp

@@ -555,7 +555,7 @@ unsigned char String::equalsConstantTime(const String &s2) const {
     //at this point lengths are the same
     if(len() == 0)
         return 1;
-    //at this point lenghts are the same and non-zero
+    //at this point lengths are the same and non-zero
     const char *p1 = buffer();
     const char *p2 = s2.buffer();
     unsigned int equalchars = 0;

libraries/HTTPClient/examples/StreamHttpClient/StreamHttpClient.ino

@@ -56,7 +56,7 @@ void loop() {
             // file found at server
             if(httpCode == HTTP_CODE_OK) {
 
-                // get lenght of document (is -1 when Server sends no Content-Length header)
+                // get length of document (is -1 when Server sends no Content-Length header)
                 int len = http.getSize();
 
                 // create buffer for read