tools/doc licensed properly - do not exclude it.

debian/rules

@@ -10,8 +10,6 @@ DEB_UPSTREAM_TARBALL_BASENAME = node-v$(DEB_UPSTREAM_TARBALL_VERSION)
 
 DEB_UPSTREAM_WGET_OPTS += --no-check-certificate
 # ./deps/npm contains some non-DFSG files, repackaging is needed.
-# ./tools/doc/ is unlicensed, https://github.com/joyent/node/issues/2872
-# and will be fixed in 0.6.13, https://github.com/joyent/node/commit/33f9074a.
 # Conveniently, remove unused software to ease debian/copyright maintenance.
 DEB_UPSTREAM_REPACKAGE_EXCLUDES += \
 ./deps/npm/ \
@@ -24,8 +22,7 @@ DEB_UPSTREAM_REPACKAGE_EXCLUDES += \
 ./deps/uv/include/uv-private/tree.h \
 ./tools/scons/ \
 ./tools/gyp/ \
-./tools/closure_linter/ \
-./tools/doc/
+./tools/closure_linter/
 
 DEB_UPSTREAM_REPACKAGE_TAG = $(shell echo $(DEB_UPSTREAM_VERSION) | egrep -o "dfsg[0-9]+")