iPXE document about the existence of prebuilt images
iPXE document about the existence of prebuilt images

Prior to this patch the Ironic documentation was only mentioning about
the images which are packaged by the supported distros and about compiling
an iPXE image from source.  This patch extends the documentation to talk
about the prebuilt images that are distributed by the iPXE project.

The patch also fixes the syntax of the note RST tag.

Change-Id: I3b4230e5a43e4db5268e1d0c2a1dcdf25ffac396

NaohiroTamura/ironic,SauloAislan/ironic,openstack/ironic,devananda/ironic,openstack/ironic,bacaldwell/ironic,hpproliant/ironic,ionutbalutoiu/ironic,NaohiroTamura/ironic,dims/ironic,bacaldwell/ironic,ionutbalutoiu/ironic,pshchelo/ironic,dims/ironic,SauloAislan/ironic,pshchelo/ironic