[NFC] Fix title comment typo and provide description for LLJIT example.

//===-- examples/HowToUseJIT/HowToUseJIT.cpp - An example use of the JIT --===//

//===------- HowToUseLLJIT.cpp - An example use of ORC-based LLJIT --------===//

//

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

// See https://llvm.org/LICENSE.txt for license information.

// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

//

//===----------------------------------------------------------------------===//

//

//  This small program provides an example of how to quickly build a small

//  module with a 'add1' function and use of IRBuilder to create add & return

//  instructions.

//

// Goal:

//  The goal of this snippet is to create in the memory

//  the LLVM module consisting of a function as follow:

//

// int add1(int x) {

//   return x+1;

// }

//  add1(42);

//

// then compile the module via LLJIT, then execute the 'add1'

// function and return result to a driver, i.e. to a "host program".

//

//===----------------------------------------------------------------------===//

#include "llvm/ExecutionEngine/Orc/LLJIT.h"

#include "llvm/IR/Function.h"