Revert "docs: multidomain: add missing uci commit in gluon-reconfigure example"

This reverts commit b92e4044.

Committing in this case is unnecessary as that job is already handled by 998-commit
which is in a superior position to commit, as it is run after all relevant changes to
the configuration have been made.

docs/features/multidomain.rst

@@ -93,7 +93,6 @@ Switching the domain
 ::
 
     uci set gluon.core.domain="newdomaincode"
-    uci commit gluon.core.domain
     gluon-reconfigure
     reboot