code spell checking - part1 (core)

I've found a code spellchecker, so this is what can be corrected easily. Changes are only affecting comments, readme and a few user-visible strings. So no functional impact expected.

wled00/util.cpp

@@ -231,7 +231,7 @@ void releaseJSONBufferLock()
 
 
 // extracts effect mode (or palette) name from names serialized string
-// caller must provide large enough buffer for name (incluing SR extensions)!
+// caller must provide large enough buffer for name (including SR extensions)!
 uint8_t extractModeName(uint8_t mode, const char *src, char *dest, uint8_t maxLen)
 {
   if (src == JSON_mode_names || src == nullptr) {