I would move it before the "cd FreshRSS" line and include base directory just to be sure (mostly in cases with symlink):

...
sudo git clone https://github.com/FreshRSS/FreshRSS.git
+
+# If you would like to allow Web updates (not needed for updates with git)
+sudo chmod g+w FreshRSS -R
+
cd FreshRSS
...

Aren't the following two approaches producing the exact same result?
. is the base directory

sudo chmod g+w FreshRSS -R
cd FreshRSS

cd FreshRSS
sudo chmod g+w . -R

Yes, my bad, ignore the previous comment, you are correct.