Documentation notes

I've been poking through the PDF documentation, and the SYNTAX for LOOP 
section extends off the page to the right, so part of it is not visible 
to the reader. QUERY, SELECT, MAP-QUERY and DO-QUERY seem to have 
similar truncations. For some other functions, like PRINT-QUERY, it 
becomes confusing because it looks like it is truncated, but it just has 
no result. Maybe using "=> nil" the way they do in the Hyperspec for 
functions with no return value would make it more clear.

I don't know enough DocBook myself to fix this, but I thought I'd point 
it out.

-Harold