Revert "Our RST is good enough for the strictest parsing \o/"

Dridi/dag tell me that changes.rst is not ready for it.

This reverts commit 10633ae0.

doc/Makefile.am

 #
 #
-RST2ANY_FLAGS = --strict
+RST2ANY_FLAGS = --halt=2
 
 EXTRA_DIST = changes.rst changes.html