syntaxes: remove quotes from each syntax name, and color it differently

The different color will make the name stand out, as it should, instead
of looking the same as all the regex strings.

syntax/ruby.nanorc

@@ -1,6 +1,6 @@
 ## Here is an example for Ruby.
 
-syntax "ruby" "\.rb$"
+syntax ruby "\.rb$"
 header "^#!.*ruby[-0-9._]*"
 magic "Ruby script"
 linter ruby -w -c