git/cheat-sheet.md: Fix 'Incorperate' -> 'Incorporate' typo

diff --git a/git b/git
index 0ea0528e9acb696852d48396987d4f826719044f..69d18426ef42d6b1bb4518012edffda4c0a7f812 160000 (submodule)
--- a/git
+++ b/git
@@ -1 +1 @@
-Subproject commit 0ea0528e9acb696852d48396987d4f826719044f
+Subproject commit 69d18426ef42d6b1bb4518012edffda4c0a7f812