git reflog: add page (#2042)

pages/common/git-reflog.md

@@ -0,0 +1,11 @@
+# git reflog
+
+> Show when the reference logs were updated in local repository.
+
+- View reflog:
+
+`git reflog`
+
+- View 5 latest entries in reflog:
+
+`git reflog -n {{5}}`