Adds some text for the cut command

Moves and steals from awk, will have to reformat that section to fit in
with the new text
Adds some more to cut
Makes some grammar changes and fixes a code block
Changes the delimiter in one example

Changes to useing '|' instead of ' - ' because it's more likely to be
used in real life
Adds a piece about character positions with cut
Changes the awk section to try and make it flow on from cut

Using the same examples, so they don't need to be introduced in the same
way both times.
Puts each sentence on its own line

To follow the required specs.
Removes trailing space
Merge pull request #175 from mgriffin/cut_additions

Adds in some information for cut