DOC: fix formatting error in io.rst
DOC: fix formatting error in io.rst

Lines had an extra space causing the code block above to keep going for the rest of the note.
MJuddBooth/pandas,nmartensen/pandas,rs2/pandas,TomAugspurger/pandas,linebp/pandas,Winand/pandas,toobaz/pandas,louispotok/pandas,louispotok/pandas,GuessWhoSamFoo/pandas,louispotok/pandas,Winand/pandas,cython-testbed/pandas,jmmease/pandas,Winand/pandas,zfrenchee/pandas,datapythonista/pandas,datapythonista/pandas,dsm054/pandas,kdebrab/pandas,dsm054/pandas,pratapvardhan/pandas,MJuddBooth/pandas,GuessWhoSamFoo/pandas,nmartensen/pandas,dsm054/pandas,GuessWhoSamFoo/pandas,zfrenchee/pandas,rs2/pandas,harisbal/pandas,winklerand/pandas,jmmease/pandas,Winand/pandas,toobaz/pandas,datapythonista/pandas,jreback/pandas,winklerand/pandas,DGrady/pandas,rs2/pandas,amolkahat/pandas,rs2/pandas,gfyoung/pandas,TomAugspurger/pandas,MJuddBooth/pandas,nmartensen/pandas,winklerand/pandas,cbertinato/pandas,TomAugspurger/pandas,DGrady/pandas,nmartensen/pandas,gfyoung/pandas,linebp/pandas,linebp/pandas,jreback/pandas,harisbal/pandas,cbertinato/pandas,DGrady/pandas,jmmease/pandas,nmartensen/pandas,gfyoung/pandas,gfyoung/pandas,linebp/pandas,MJuddBooth/pandas,GuessWhoSamFoo/pandas,jorisvandenbossche/pandas,linebp/pandas,cython-testbed/pandas,toobaz/pandas,dsm054/pandas,DGrady/pandas,zfrenchee/pandas,winklerand/pandas,amolkahat/pandas,DGrady/pandas,harisbal/pandas,winklerand/pandas,zfrenchee/pandas,pandas-dev/pandas,louispotok/pandas,harisbal/pandas,amolkahat/pandas,pratapvardhan/pandas,jreback/pandas,Winand/pandas,pandas-dev/pandas,louispotok/pandas,GuessWhoSamFoo/pandas,kdebrab/pandas,gfyoung/pandas,amolkahat/pandas,pratapvardhan/pandas,pandas-dev/pandas,kdebrab/pandas,dsm054/pandas,datapythonista/pandas,amolkahat/pandas,jreback/pandas,DGrady/pandas,TomAugspurger/pandas,jorisvandenbossche/pandas,jmmease/pandas,winklerand/pandas,cython-testbed/pandas,harisbal/pandas,jreback/pandas,cbertinato/pandas,pandas-dev/pandas,linebp/pandas,zfrenchee/pandas,toobaz/pandas,cbertinato/pandas,kdebrab/pandas,pratapvardhan/pandas,kdebrab/pandas,jmmease/pandas,cython-testbed/pandas,toobaz/pandas,jmmease/pandas,MJuddBooth/pandas,cbertinato/pandas,nmartensen/pandas,cython-testbed/pandas,jorisvandenbossche/pandas,jorisvandenbossche/pandas,Winand/pandas,pratapvardhan/pandas