docs: update instructions to update old email (tldr-pages#7509)

contributing-guides/git-terminal.md

@@ -68,24 +68,25 @@ git push --force-with-lease
 
 # Changing the email of any commit(s)
 
-Let's take this commit history as an example:
+1. Perform an [interactive rebase](https://git-scm.com/docs/git-rebase#Documentation/git-rebase.txt--i) specifying the reference of the earliest commit to modify as the argument. For example, if the earlist commit with the wrong email address was 6 commits ago, you can specify the commit hash or just `HEAD~6`.
 
-| Commit Hash | Author Email
-|---|---
-| A | wrong@example.org
-| B | correct@example.org
-| C | correct@example.org
-| D | wrong@example.org
-| E | correct@example.org
-| F (HEAD) | correct@example.org
+```bash
+git rebase --interactive HEAD~6
+```
+
+2. You'll see a list of commits starting from the referenced commit to `HEAD`. All of them will default to the instruction `pick`, this means use the commit as-is when replaying them. For the commits you want to edit, replace the word `pick` for `edit`, then save and exit the editor.
+
+3. The branch will rewind to the referenced commit, then replay them until it reaches a commit with the `edit` instruction. Amend the commit for the correct email address, then continue rebasing. Repeat this step until you've succesfully finishing rebasing and replayed all commits.
 
-To change the email of commits A and D, run
+```bash
+git commit --amend --author "Your Name <correct@example.org>"
+git rebase --continue
+```
+
+4. Finally, because you modified the branch history, you'll need to force push back to your remote repository.
 
 ```bash
-git reset A
-git commit --amend --author="Your Name <correct@example.org>"
-git cherry-pick B^..D # re-apply commits B to D
-git commit --amend --author="Your Name <correct@example.org>"
-git cherry-pick E^..HEAD
 git push --force-with-lease
 ```
+
+[![asciicast](https://asciinema.org/a/fFMZzQOgJyfUf8HTnXyRj0v02.svg)](https://asciinema.org/a/fFMZzQOgJyfUf8HTnXyRj0v02)