git-stamp: add page (#8730)

pages/common/git-stamp.md

@@ -0,0 +1,17 @@
+# git stamp
+
+> Stamp the last commit message, with the possibility to reference the issues numbers from your bug tracker or link to its review page.
+> Part of `git-extras`.
+> More information: <https://github.com/tj/git-extras/blob/master/Commands.md#git-stamp>.
+
+- Stamp the last commit message referencing it with the issue number from your bug tracker:
+
+`git stamp {{issue_number}}`
+
+- Stamp the last commit message linking it to its review page:
+
+`git stamp {{Review https://example.org/path/to/review}}`
+
+- Stamp the last commit message replacing previous issues with a new one:
+
+`git stamp --replace {{issue_number}}`