More doc updates for FLASK_APP
More doc updates for FLASK_APP

dawran6/flask,karlw00t/flask,pallets/flask,auready/flask,antsar/flask,wldtyp/flask,drewja/flask,fkazimierczak/flask,wldtyp/flask,dawran6/flask,hyunchel/flask,hyunchel/flask,Endika/flask,Endika/flask,fkazimierczak/flask,adrianmoisey/cptdevops,tristanfisher/flask,mitsuhiko/flask,tristanfisher/flask,drewja/flask,pallets/flask,mitsuhiko/flask,antsar/flask,pallets/flask,drewja/flask,fkazimierczak/flask,karlw00t/flask,auready/flask,adrianmoisey/cptdevops