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

docs/blueprints.rst

@@ -176,16 +176,25 @@ the `template_folder` parameter to the :class:`Blueprint` constructor::
 
     admin = Blueprint('admin', __name__, template_folder='templates')
 
-As for static files, the path can be absolute or relative to the blueprint
-resource folder.  The template folder is added to the searchpath of
-templates but with a lower priority than the actual application's template
-folder.  That way you can easily override templates that a blueprint
-provides in the actual application.
+For static files, the path can be absolute or relative to the blueprint
+resource folder.  
+
+The template folder is added to the search path of templates but with a lower 
+priority than the actual application's template folder. That way you can 
+easily override templates that a blueprint provides in the actual application. 
+This also means that if you don't want a blueprint template to be accidentally
+overridden, make sure that no other blueprint or actual application template
+has the same relative path. When multiple blueprints provide the same relative
+template path the first blueprint registered takes precedence over the others.
+
 
 So if you have a blueprint in the folder ``yourapplication/admin`` and you
 want to render the template ``'admin/index.html'`` and you have provided
 ``templates`` as a `template_folder` you will have to create a file like
-this: :file:`yourapplication/admin/templates/admin/index.html`.
+this: :file:`yourapplication/admin/templates/admin/index.html`. The reason
+for the extra ``admin`` folder is to avoid getting our template overridden
+by a template named ``index.html`` in the actual application template
+folder.  
 
 To further reiterate this: if you have a blueprint named ``admin`` and you
 want to render a template called :file:`index.html` which is specific to this