Organize comma-separated values in @docs

Seems like a useful one: start with this...

```
# Attributes
@docs textDecoration, textAlign, textOverflow
```

...and compact the spaces as if it were in a list, into:

```
# Attributes
@docs textDecoration, textAlign, textOverflow
```

Start by locating the formatter code that handles @docs declarations and comma-separated values, then inspect any existing formatting tests around that syntax. Done means the extra alignment spaces are compacted to single spaces as shown in the issue without changing other formatting.

Written by the indexing model from the issue text.