Update instructions.md

Highlighting/instructions.md

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+XML files for Notepad++ highlighting are present in this folder, and I will add such files for other editors, when available. Meanwhile, you can use the instructions below to set the highlighting in your favourite editor manually - it shouldn't be too difficult. You can use different colors if you like, of course.
 
 * Color keywords dark blue. Keywords are commas "," semicolons ";" and production arrows "->"  
 * Color comments green and make italic. Allow comments anywhere and allow comments folding. Line comments start with two forward slashes "//" and end with a new line symbol "\n". Delimited comments start with a forward slash and a star "/\*" and end with a star and a forward slash "\*/"  
 * Color tags dark blue as well, and make bold. Tags are groups that start with lesser then symbol "<" and end with a greater then symbol ">"  
-* 
+* Color decorators purple or cyan or magenta. Decorators are groups that start with curly bracket "{" and end with a curly bracket "}"  
+* Color links red. Links start with square bracket "\[" and end with square bracket "\]"
+* Optionally, add one more group to color text in regular brackets in light-gray "(" and ")"