Remove another reference to update.sh in docs

BUG=494442
[email protected]

Review URL: https://codereview.chromium.org/1494803006 .

Cr-Commit-Position: refs/heads/master@{#363202}
diff --git a/docs/clang.md b/docs/clang.md
index 15bf264..516d6fb 100644
--- a/docs/clang.md
+++ b/docs/clang.md
@@ -16,7 +16,7 @@
 
 Get clang (happens automatically during `gclient runhooks` on Mac and Linux):
 
-    tools/clang/scripts/update.sh
+    tools/clang/scripts/update.py
 
 (Only needs to be run once per checkout, and clang will be automatically updated
 by `gclient runhooks`.)
@@ -128,6 +128,6 @@
 
 If your clang revision is very different from the one currently used in chromium
 
-*   Check `tools/clang/scripts/update.sh` to find chromium's clang revision
+*   Check `tools/clang/scripts/update.py` to find chromium's clang revision
 *   You might have to tweak warning flags. Or you could set `werror=` in the
     line above to disable warnings as errors (but this only works on Linux).