Small edit to git clone command in documentation

[fmemuir]

For: openjournals/joss-reviews#6683

Very minor issue, but trying to clone the repo using git clone coastseg --depth 1 https://github.com/Doodleverse/CoastSeg.git gives the error:
fatal: repository 'coastseg' does not exist
if the user has not made a folder called 'coastseg' first. Probably better to just have the command as:
git clone --depth 1 https://github.com/Doodleverse/CoastSeg.git
as a folder called 'CoastSeg' then gets created anyway.

[2320sharon]

Hi @fmemuir

Thank you for reviewing CoastSeg. I'll update the documentation with this change.

[2320sharon]

Thank you for this suggestion its much more convenient to have a single CoastSeg folder for most users. The website is now updated with the new git clone command you suggested here. I appreciate it!