Ruby: fix documentation

Author: alexrford

ruby/ql/lib/codeql/ruby/security/UnsafeDeserializationCustomizations.qll

@@ -49,7 +49,8 @@ module UnsafeDeserialization {
 
   /**
    * An argument in a call to `YAML.load` or `YAML.load_file`, considered a sink
-   * for unsafe deserialization. As the `YAML` module is an alias of `Psych` in
+   * for unsafe deserialization. The `YAML` module is an alias of `Psych` in
+   * recent versions of Ruby.
    */
   class YamlLoadArgument extends Sink {
     YamlLoadArgument() {