No need any paper as u r under your husbands sponsership.You can see this information on http://portal.www.gov.qa under exit permit section.

It is written that:

"All residents except wives and children under the sponsorship of their family members are required to obtain an exit permit when leaving Qatar.

The sponsor is responsible for arranging the exit permit. Authorized users may complete the procedure online.

There are two types of exit permits – multiple and single."

HAppy juorney.