Merge branch 'update-developer-docs-37184' into 'master'

update developer docs

Summary

I noticed that the command to squash commits only does the squash and does not actually do the rebase. 
```
git reset $(git merge-base origin/main $(git rev-parse --abbrev-ref HEAD))
```
The main change to the docs is to add the command to rebase
```
git rebase origin/master
```
or
```
git rebase origin/main
```
as the final step before asking for merge approvals

See merge request platform-one/big-bang/bigbang!324