Removed lingering `git_scripts` reference.

Tiny change to the usage documentation per b9aa31f.

Closes https://github.com/google/iree/pull/771

COPYBARA_INTEGRATE_REVIEW=https://github.com/google/iree/pull/771 from phoenix-meadowlark:patch-1 b94567e5ccac5862620514d48ef0698ad0865c12
PiperOrigin-RevId: 295296171

scripts/git/update_tf_llvm_submodules.py

diff --git a/scripts/git/update_tf_llvm_submodules.py b/scripts/git/update_tf_llvm_submodules.py
index 92a5550..663b6f2 100755
--- a/scripts/git/update_tf_llvm_submodules.py
+++ b/scripts/git/update_tf_llvm_submodules.py
@@ -24,7 +24,7 @@
 files must be sync'd for the new version.
 
 Typical usage:
-  Syntax: ./git_scripts/update_tf_llvm_modules.py
+  Syntax: ./scripts/git/update_tf_llvm_modules.py
 
   By default, this will update the tensorflow submodule to remote HEAD and
   update the llvm-project submodule to the corresponding version. It will