Add notice in customizer that sidebar won't appear when content width is > 95%
Description:
Let's have a notice in customizer that appears when the sidebar si greater than 95% that lets the user know the sidebar appears only if content width is lower than 95%.
We have something similar neve meta options:

@cristian-ungureanu I've added this but currently have it show after 80% so that we can use the same string used before.
I noticed that the sidebar doesn't actually disappear after 95% when changing the content width in customizer...it actually stays intact, is that a bug?
@UVLabs if the post/page has some custom settings in the editor ( from the sidebar that shows in the screenshot ) you won't see any changes in the customizer.