Add commit update snippets

snippets/update-commit-contents.md

@@ -0,0 +1,21 @@
+---
+title: Edit the last commit
+tags: commit,beginner
+---
+
+Updates the last commit's contents without changing its message.
+
+- Use `git commit --amend --no-edit` to add any staged changes to the last commit, without changing its message.
+
+```sh
+git commit --amend --no-edit
+```
+
+```sh
+git add .
+git commit -m "Fix the network bug"
+# Edit or add files
+git add .
+git commit --amend --no-edit
+# The last commit includes the edited/added files
+```

snippets/update-commit-message.md

@@ -0,0 +1,19 @@
+---
+title: Change the last commit's message
+tags: commit,beginner
+---
+
+Updates the last commit's message without changing its contents.
+
+- Use `git commit --amend -m <message>` to replace the last commit's message with the new `<message>`.
+
+```sh
+git commit --amend -m <message>
+```
+
+```sh
+git add .
+git commit -m "Fix the newtork bug"
+git commit --amend -m "Fix the network bug"
+# The last commit's message is now "Fix the network bug"
+```