Libdoc: Fine-tune keyword table column widths.
Libdoc: Fine-tune keyword table column widths.

After splitting arguments to own rows (#3639) column widths didn't
look good.

If tags are present, widths don't add up to 100% but trying to modify
widths dynamically using Javascript didn't have any effect. Ought to
be ok to let browsers handle that.

HelioGuilherme66/robotframework,robotframework/robotframework,robotframework/robotframework,robotframework/robotframework,HelioGuilherme66/robotframework,HelioGuilherme66/robotframework