Update docs/codeql/reusables/kotlin-java-differences.rst

Co-authored-by: Felicity Chapman <felicitymay@github.com>

Author: subatoi

docs/codeql/reusables/kotlin-java-differences.rst

@@ -11,7 +11,7 @@ Be careful when you model code elements that don’t exist in Java, such as ``No
    
    someVar!!.someMethodCall()
 
-In that specific case, you can use the predicate `Expr.getUnderlyingExpr()`. This goes directly to the underlying `VarAccess`` to produce a more similar behavior to that in Java.
+In that specific case, you can use the predicate ``Expr.getUnderlyingExpr()``. This goes directly to the underlying ``VarAccess`` to produce a more similar behavior to that in Java.
 
 Nullable elements (`?`) can also produce unexpected behavior. To avoid a `NullPointerException`, Kotlin may inline calls like `expr.toString()` to `String.valueOf(expr)` when `expr` is nullable. Make sure that you write CodeQL around the extracted code, and do not directly modify the source code in the codebase.