[Git] Save patch & apply later git command

```
# save your working copy changes
git diff > some.patch

# re-apply it later
git apply some.patch
```

Start by locating the repository's existing documentation or command list for Git-related entries and checking its contribution conventions. Add the supplied save-and-reapply patch commands in the appropriate place, keeping the examples readable. Done means users can find both commands and understand that the patch can be applied later.

Written by the indexing model from the issue text.