Fix invalid toml in rule.add-constant example (#819)

Author: flesser

RULES_DESCRIPTIONS.md

@@ -92,7 +92,7 @@ Example:
 
 ```toml
 [rule.add-constant]
-  arguments = [{maxLitCount = "3",allowStrs ="\"\"",allowInts="0,1,2",allowFloats="0.0,0.,1.0,1.,2.0,2.","ignoreFuncs": "os\\.*,fmt\\.Println,make"}]
+  arguments = [{ maxLitCount = "3", allowStrs = "\"\"", allowInts = "0,1,2", allowFloats = "0.0,0.,1.0,1.,2.0,2.", ignoreFuncs = "os\\.*,fmt\\.Println,make" }]
 ```
 
 ## argument-limit