Add a bit more explanations on the meaning of OBSOLETE and EXPERIMENTAL.

-------- diffstat follows --------
/trunk/config/global/ct-behave.in | 22 13 9 0 +++++++++++++---------
/trunk/docs/overview.txt | 8 6 2 0 ++++++--
2 files changed, 19 insertions(+), 11 deletions(-)

 # Compute IA-64-specific values

 CT_DoArchTupleValues() {

     # The architecture part of the tuple:

     CT_TARGET_ARCH="${CT_ARCH}"

 }