Mention the template name conflict issue in blueprint templates docs (#1843)
Mention the template name conflict issue in blueprint templates docs (#1843)

* Mention the template name conflict issue in docs.
In the blueprints templates documentation mention
the possible templates name conflict issue
re #266

* Mention priorities between blueprints
and other rephrasing fixes

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