Add suffix to documentation.
# Please enter the commit message for your changes. Lines starting
# with '#' will be ignored, and an empty message aborts the commit.
# On branch add-suffix
# Changes to be committed:
#   (use "git reset HEAD <file>..." to unstage)
#
#	modified:   docs/configure.rst
#	modified:   docs/index.rst
#	modified:   docs/reference.rst
#