Add note about using `git am` to apply the commit message

As I found that was a thing yesterday!

content/posts/2019-12-17-git-format-patch-apply-backport-replay-changes.md

 ---
-title: "Backporting/Replaying Changes using `git format-patch` and `git apply`"
-description: "Using `git format-patch` and `git apply` to apply a patch, if `git cherry-pick` isn't available."
+title: "Backporting/Replaying Changes using `git format-patch` and `git apply` / `git-am`"
+description: "Using `git format-patch` and `git apply`/`git am` to apply a patch, if `git cherry-pick` isn't available."
 tags:
 - blogumentation
 - git
@@ -66,4 +66,10 @@ And then we can then feed this file into `git apply`:
 $ git apply < patch
 ```
 
+However, this doesn't quite work when you want to use the commit message, too. For this, we can use `git am`:
+
+```sh
+$ git am < patch
+```
+
 This _may_ have issues if the patch doesn't apply cleanly, but once resolved, you'll have the commit applied with patch and commit message!