Description of the problem, including code/CLI snippet

1/ Bad spelling in document in http://python-gitlab.readthedocs.io/en/stable/gl_objects/snippets.html
2/ Missing Update Snippet Content feature

Expected Behavior

1/ giltab.Gitlab.snippets

Actual Behavior

1/ gilab.Gitlab.snippets
(missing a t)

Specifications

• python-gitlab version:
• API version you are using (v3/v4):
• Gitlab server version (or gitlab.com):

I only see typical update Snippets attributes, but I dont see a way to update the snippet Content via provided API.