Documentation bug: group_files keyword argument reader doc has sentence consisting of only the word "This"

[gerritholl]

Describe the bug

The [documentation for satpy.readers.group_files, keyword argument reader, is as follows:

Reader whose file patterns should be used to sort files. This

The second sentence is just "This", and appears broken off.

To Reproduce

• Open a browser
• Navigate to https://satpy.readthedocs.io/en/latest/api/satpy.readers.html#satpy.readers.group_files
• Read parameters for function satpy.readers.group_files.

Expected behavior

I expect complete sentences explaining the use of the keyword argument reader.

Actual results

I'm getting an incomplete sentence consisting of only the word "This".

Screenshots

Environment Info:

Version "latest" on readthedocs as of 2020-04-15.

Additional context

I suspect this sentence was intended to say something about this keyword argument being optional or mandatory or how it is being used.

[djhoese]

I would say this is incomplete rather than a bug. I started typing something and got distracted and never went back to finish it.

Edit: I'll see if I can figure out what I wanted to say later today and make a PR.