Update docs/overview.txt with the script shell fragment that defines bash completion.

/trunk/docs/overview.txt | 14 14 0 0 ++++++++++++++
1 file changed, 14 insertions(+)

# Compute x86_64-specific values

CT_DoArchValues() {

    # The architecture part of the tuple:

    CT_TARGET_ARCH="${CT_ARCH}"

}