Fix test implementation in examples and change README description on test

Author: A223D

README.md

@@ -83,7 +83,7 @@ This constructor is used to create the object which represents the screen. You c
 	```c++
 	void Adafruit_4_01_ColourEPaper::test(void);
 	```
-	This function is provided to test if a display works properly. It draws vertical bars of all the colours available in the frame buffer. Use `display()` and one of the two mentioned methods to complete the screen write procedure.
+	This function is provided to test if a display works properly. It bypasses the frame buffer and directly writes vertical bars of each colour to the screen. Use one of the two mentioned methods to complete the screen write procedure.
 
 * **Wait For Screen (Blocking)**
 	```c++

examples/modifiedAdafruitGFXExample/modifiedAdafruitGFXExample.ino

@@ -249,7 +249,6 @@ void loop()
     Serial.println("Drawing vertical bars of all colours on the screen");
     ePaperObject.clearDisplay();
     ePaperObject.test();
-    ePaperObject.display();
     ePaperObject.waitForScreenBlocking();
 
     Serial.println("Done");

examples/testFunction/testFunction.ino

@@ -25,7 +25,6 @@ void setup()
   delay(10000); // wait for 10 seconds
 
   ePaperObject.test();
-  ePaperObject.display();
   while (ePaperObject.checkBusy())
     ;
   ePaperObject.sendPOFandLeaveSPI();