Java: Fix qhelp.

Author: aschackmull

java/ql/src/Likely Bugs/Concurrency/DoubleCheckedLockingShared.qhelp

@@ -68,8 +68,8 @@ variable can be used to avoid reading the field more times than neccessary.
 
 <p>
 As a final note, it is possible to use double-checked locking correctly without
-<code>volatile</code> if the object you construct is immutable. That is, the
-object declares all fields as <code>final</code>, and the double-checked field
+<code>volatile</code> if the object you construct is immutable (that is, the
+object declares all fields as <code>final</code>), and the double-checked field
 is read exactly once outside the synchronized block.
 </p>
 <p>