Remove stray references to update.sh from src/

BUG=494442
[email protected]

Review URL: https://codereview.chromium.org/1489223003 .

Cr-Commit-Position: refs/heads/master@{#362772}
diff --git a/docs/clang_tool_refactoring.md b/docs/clang_tool_refactoring.md
index 929d8a27..48e7c60a 100644
--- a/docs/clang_tool_refactoring.md
+++ b/docs/clang_tool_refactoring.md
@@ -25,7 +25,7 @@
 or later):
 
 ```shell
-tools/clang/scripts/update.sh --force-local-build --without-android \
+tools/clang/scripts/update.py --force-local-build --without-android \
 --with-chrome-tools <tools>
 ```
 
@@ -35,7 +35,7 @@
 plugin and the empty\_string tool, run the following:
 
 ```shell
-tools/clang/scripts/update.sh --force-local-build --without-android \
+tools/clang/scripts/update.py --force-local-build --without-android \
 --with-chrome-tools "plugins;empty_string"
 ```