doc: html.fragment_fromstring create_parent

[Gábor Farkas]

when you use the create_parent=True option of html.fragment_fromstring,
then it is not an error if there is more than one element, it will be wrapped
into a new parent element. but the documentation does not say so.
about "create_parent" it only says:

"""
    If create_parent is true (or is a tag name) then a parent node
    will be created to encapsulate the HTML in a single element. In
    this case, leading or trailing text is allowed.
"""

i think the documentation should be updated that in this case also multiple elements
are allowed and handled.

i am planning to use this feature, but i'm a little hesitant because it is "undocumented"

[scoder (scoder)]

I clarified the docs, multiple elements are ok in this case.

https://github.com/lxml/lxml/commit/8bbadc250fb838c79ad9dcce758befc1c4f30664

[scoder (scoder)]

Fix released in lxml 3.4.2.