Updated some regexes

One of the expressions used .* to mean 'any character except newline', but since I've
enabled 'RE_SINGLE_LINE' mode, a dot matches a newline as well.

config/go.conf

@@ -1,7 +1,7 @@
 # Priority decreases going downward ie. If two regexes match the same piece of
 # text, the one defined earlier will take precedence over the one defined later.
 # Comments
-'//.*': GRAY
+'//[^\n]*': GRAY
 '/\*[^*]*\*+(?:[^/*][^*]*\*+)*/': GRAY
 # Numbers and special values
 '\b\-?[0-9]*\b': MAGENTA