Added very minor code comments

src/TinyGsmClientXBee.h

@@ -651,6 +651,10 @@ fail:
 
   int getBattPercent() TINY_GSM_ATTR_NOT_AVAILABLE;
 
+  /*
+   * Client related functions
+   */
+
 protected:
 
   bool modemConnect(const char* host, uint16_t port, uint8_t mux = 0, bool ssl = false) {
@@ -716,7 +720,9 @@ protected:
 
 public:
 
-  /* Utilities */
+  /*
+   Utilities
+   */
 
   template<typename T>
   void streamWrite(T last) {