Added very minor code comments

src/TinyGsmClientESP8266.h

@@ -191,6 +191,7 @@ public:
   }
 };
 
+
 public:
 
   TinyGsmESP8266(Stream& stream)
@@ -386,6 +387,10 @@ public:
     return res2;
   }
 
+  /*
+   * Client related functions
+   */
+
 protected:
 
   bool modemConnect(const char* host, uint16_t port, uint8_t mux, bool ssl = false) {
@@ -423,7 +428,9 @@ protected:
 
 public:
 
-  /* Utilities */
+  /*
+   Utilities
+   */
 
   template<typename T>
   void streamWrite(T last) {