title: How to change fetch URL of a git repository.
body: <p>I have a github profile and I forked someone's repository into mine. 
  and locally I have cloned this repository using </p>
  
  <pre><code>git clone https://github.com/my-github-page/repo-name
  </code></pre>
  
  <p>Now, since some time has passed the original repo owner has update his repo, but mine is behind. So, if I would like to do <code>git pull</code> to merge his changes into mine. But I would like to push my changes from local to mine. </p>
  
  <p>In simple terms, if I do <code>git remote show origin</code> I get this:</p>
  
  <pre><code>[root@localhost xxx]# git remote show origin
  * remote origin
    Fetch URL: https://github.com/my-github-profile/xxx
    Push  URL: https://github.com/my-github-profile/xxx
    HEAD branch: master
    Remote branches:
      1.0          tracked
      master       tracked
      system_tests tracked
    Local branch configured for 'git pull':
      master merges with remote master
    Local ref configured for 'git push':
      master pushes to master (up to date)
  </code></pre>
  
  <p>Now I want to change the FETCH URL to the original src of the repo. Because the original is updated but my fork is behind</p>