app-misc/sway should depend on app-text/asciidoc

[fpemud]

app-text/asciidoc should be added into DEPEND, but not RDEPEND.

emerge succeed after "emerge -1 app-text/asciidoc".
failure message:

fpemud-workstation / # emerge sway
Calculating dependencies... done!

>>> Verifying ebuild manifests

>>> Emerging (1 of 1) app-misc/sway-9999::layman
>>> Unpacking source...
 * Fetching https://github.com/SirCmpwn/sway.git ...
git fetch https://github.com/SirCmpwn/sway.git +HEAD:refs/git-r3/HEAD
git symbolic-ref refs/git-r3/app-misc/sway/0/__main__ refs/heads/master
...
-- Looking for backtrace - found
-- backtrace facility detected in default set of libraries
-- Found Backtrace: /usr/include  
CMake Error at /usr/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:148 (message):
  Could NOT find A2X (missing: A2X_COMMAND)
Call Stack (most recent call first):
  /usr/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:388 (_FPHSA_FAILURE_MESSAGE)
  CMake/FindA2X.cmake:72 (find_package_handle_standard_args)
  CMake/Manpage.cmake:1 (find_package)
  CMakeLists.txt:72 (include)