sf: st_point signature wrong (typo)

The sf cheatsheet lists the signature of `st_point` as

```
st_point(x, c(numeric vector), dim = "XYZ")
```

where it should be 

```
st_point(x = c(numeric vector), dim = "XYZ")
```

Screenshot with context:

<img width="448" height="415" alt="Image" src="https://github.com/user-attachments/assets/ab178a75-594c-4218-a6fc-205f49781a59" />