Mention dev-nosan-lg instead of dev-lg in eden/scm/targets.bzl

Summary: dev-lg is **exactly the same** mode as dev-nosan-lg, meaning "no sanitizers", but it's not clear from the name. For clarity, replacing dev-lg with dev-nosan-lg

Reviewed By: quark-zju

Differential Revision: D54912351

fbshipit-source-id: e88727eab4f08da6b2c19d5ac97532a064104a48

eden/scm/targets.bzl

@@ -36,7 +36,7 @@ def gen_hgpython():
             executable = True,
         )
 
-    # We cannot quite use symlinks outside of Windows since the `dev-lg` mode is
+    # We cannot quite use symlinks outside of Windows since the `dev-nosan-lg` mode is
     # used sometimes, and that copies the binary into another location rather
     # than actually creating a symlink like in other modes for some reason.
     return buck_sh_binary(