Update cheatsheets

git-mailinfo

@@ -0,0 +1,21 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# git mailinfo
+
+> Extract patch and authorship information from a single email message.
+> More information: <https://git-scm.com/docs/git-mailinfo>.
+
+- Extract the patch and author data from an email message:
+
+`git mailinfo {{message|patch}}`
+
+- Extract but remove leading and trailing whitespace:
+
+`git mailinfo -k {{message|patch}}`
+
+- Remove everything from the body before a scissors line (e.g. "-->* --") and retrieve the message or patch:
+
+`git mailinfo --scissors {{message|patch}}`