Change Documentation covergroups to cover points

@matutem is already working on this.

Since Mar 28, 2022.

In the current DV documentation, there is a list of covergroups.
unfortunately, this method is not practical in capturing the coverpoints.

as an example, in AES I have a cover point (currently documented as a covergroup)

I think this is a crucial cover point in terms of security - but I don't want to do a specific covergroup for this alone.
I already cover the 3 different registers in other covergroups, so I could easily add a coverpoint to each of those covergroups

which means this "covergroup" is now split into 3 coverpoints in three different groups.

I suggest we update the list to match the format for test points
```
covergroups: [
{
name: My_cover_point_a
desc: '''
Make sure that we cover this point '''
covergroup: ["My_cover_group"]
}
{
name: My_cover_point_B
desc: '''
Make sure that we cover this point also'''
covergroup: ["My_cover_group",]
}
{
name: My_cover_point_C
desc: '''
Make sure that we cover this point also'''
covergroup: ["my_cover_group","My_Other_cg"]
}
]

```