Added very minor code comments

src/TinyGsmClientM590.h

@@ -519,6 +519,10 @@ public:
 
   int getBattPercent() TINY_GSM_ATTR_NOT_AVAILABLE;
 
+  /*
+   * Client related functions
+   */
+
 protected:
 
   bool modemConnect(const char* host, uint16_t port, uint8_t mux) {
@@ -576,7 +580,9 @@ protected:
 
 public:
 
-  /* Utilities */
+  /*
+   Utilities
+   */
 
   template<typename T>
   void streamWrite(T last) {