You can hide the column headings using CSS.  For example, to hide the "title" column:

  .DNN_Documents .TitleHeader {display: none}

You can change the text for the column headers by editing the localization files (in DesktopModules/Documents.App_LocalResources), but these will be overwritten when you upgrade.

Not sure if this is relevant to anyone else but as per the advise already given I changed the headings and left the title heading blank. This worked and showed no heading for the title.

I then tried the same for  the description column - Leaving this blank did not remove the heading. Changing it to something else does allow me to change the text but for some reason there must be some text.