snapcraft: lxd docs are now under doc/_build/

Since canonical/lxd#13537

Signed-off-by: Simon Deziel <simon.deziel@canonical.com>
(cherry picked from commit 0dd5da4)

snapcraft.yaml

@@ -1392,14 +1392,14 @@ parts:
         make doc
 
         # Remove unneeded bits
-        rm doc/html/objects.inv    # only objects.inv.txt is used
+        rm doc/_build/objects.inv    # only objects.inv.txt is used
         # not needed once built
-        rm doc/html/.buildinfo
-        rm -rf doc/html/_sphinx_design_static/
+        rm doc/_build/.buildinfo
+        rm -rf doc/_build/_sphinx_design_static/
 
         # Stage the static website
         mkdir -p "${CRAFT_STAGE}/share/lxd-documentation"
-        cp -a doc/html/. "${CRAFT_STAGE}/share/lxd-documentation/"
+        cp -a doc/_build/. "${CRAFT_STAGE}/share/lxd-documentation/"
       fi
 
       # Setup bash completion