version-control/git/instructor.md: git -> Git where appropriate

diff --git a/version-control b/version-control
index 58a493425a892c2696b2aa203ec3b5994417d61b..8eb7ae646cf15288c59bb5c0cf27062250cec28f 160000 (submodule)
--- a/version-control
+++ b/version-control
@@ -1 +1 @@
-Subproject commit 58a493425a892c2696b2aa203ec3b5994417d61b
+Subproject commit 8eb7ae646cf15288c59bb5c0cf27062250cec28f