http://gcc.gnu.org/onlinedocs/ only carries docs for 4.3.0 but not for the current 4.3.1-release. Generating the onlinedocs is rumored to be the person's duty who rolled the release (apparently jakub for 4.3.1).
Confirmed.
I have generated docs for both 4.3.1 and 4.3.2 and updated the links to point to 4.3.2.