Improve new syntax files and fix a region glitch

runtime/syntax/r.yaml

@@ -1,9 +1,12 @@
 filetype: r
 
-detect: 
+detect:
     filename: "\\.(r|R)$"
 
 rules:
     - statement: "\\b(break|else|for|function|if|in|next|repeat|return|while)\\b"
     - constant: "\\b(TRUE|FALSE|NULL|Inf|NaN|NA|NA_integer_|NA_real_|NA_complex_|NA_character_)\\b"
-    - comment: "#.*$"
+    - comment:
+        start: "#"
+        end: "$"
+        rules: []