Convert gendocs.sh to use rake yard

documentation/gendocs.sh

@@ -1,15 +1 @@
-OPTS="-x .ut.rb -x .ts.rb -x samples -q"
-BASE="$(dirname "$0")"
-MSFDIR="${BASE}/.."
-DOCDIR="${BASE}/api"
-doc=$(which sdoc)
-
-if [ -z $doc ]; then
-    doc=$(which rdoc)
-fi
-
-echo "Using ${doc} for doc generation"
-echo "Putting docs in ${DOCDIR}"
-
-$doc $OPTS -t "Metasploit Documentation" -o ${DOCDIR} ${MSFDIR}/lib/rex ${MSFDIR}/lib/msf
-
+rake yard