You will need to replace the document on all pages the old version exists:
You can do this by finding the page. For Example: News article or Event in your club control panel.
Remove existing document and add new document.
You can then delete the old document from your Documents section.
Click Site Content tab on the left-hand side of the page.
Click Documents in the sub-menu on the left-hand side.
Locate the document you wish to delete. Go to the spanner icon and click Delete Document.