Function def input parameter comments causing a "Javascript error"

With the following in a code cell:
```
#| export
def XCORS_trim_to_time(
f:str,
start:str,
stop:str):
pass
```

and this in a following cell:
```
show_doc(XCORS_trim_to_time)
```

I get the correct expected output:

But when inserting parameter comments as described in the
Nbdev video:

```
#| export
def XCORS_trim_to_time(
f:str, # Filename
start:str, # Start time.
stop:str): # Stop time.
pass
```

```
show_doc(XCORS_trim_to_time)
```

Below is a screencap of the resulting fail:

Reproduce the issue in a notebook using the exported XCORS_trim_to_time definition with inline parameter comments, then run show_doc(XCORS_trim_to_time) in the following cell. Compare the output with the version without comments; done means parameter comments no longer cause a JavaScript error and the documentation renders correctly.

Written by the indexing model from the issue text.