Fix gfx_template readme

Author: runer112

examples/gfx_template/readme.md

@@ -1,13 +1,11 @@
-### Template
+### GraphX Template
 
-You can clone this directory for your own projects.
+You can clone this directory for your own GraphX-based projects.
 
-To add code, fill in the void main() function in main.c. You can also create your
-own .c and .h files and add them to the directory; the Makefile included in this
-template will automatically find and compile the new .c files.
+To add code, fill in the begin, end, step, and draw functions in main.c. You can also create your own .c and .h files and add them to the directory; the Makefile included in this template will automatically find and compile the new .c files.
 
-In addition, you can also add your own .asm files, which will be detected and added
-appropritately to the proper segment.
+In addition, you can also add your own .asm files, which will be detected and
+added appropriately to the proper segment.
 
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