Merge pull request #2981 from asger-semmle/js/lower-syntax-error-severity

Approved by max-schaefer

javascript/ql/src/LanguageFeatures/SyntaxError.ql

@@ -2,12 +2,12 @@
  * @name Syntax error
  * @description A piece of code could not be parsed due to syntax errors.
  * @kind problem
- * @problem.severity error
+ * @problem.severity recommendation
  * @id js/syntax-error
  * @tags reliability
  *       correctness
  *       language-features
- * @precision high
+ * @precision very-high
  */
 
 import javascript