fix: comments

update-from-upstream.sh

@@ -1,13 +1,24 @@
 #!/bin/bash
 
+# fetch so we can merge in without first
+# having to checkout & pull the branches
 git fetch origin
 git fetch upstream
 
+# delete existing branch
 git branch -D update-from-upstream
+
+# we create a new branch from the origin's main (=HEAD, because we fetched)
 git branch update-from-upstream origin/main
+
+# check out the branch
 git checkout update-from-upstream
 
+# merge in the changes from upstream
 git merge upstream/main
+
+# set the current branch's upstream to where we need it to be so we can
+# push without being prompted
 git branch --set-upstream-to=origin/update-from-upstream update-from-upstream
 
 # git push origin update-from-upstream