change clang-format settings in docs/vscode.md and docs/qtcreator.md

docs/vscode.md

 # Use Visual Studio Code on Chromium code base
 
 [TOC]
 
 [Visual Studio Code](http://code.visualstudio.com/)
 ([Wikipedia](https://en.wikipedia.org/wiki/Visual_Studio_Code)) is a
 multi-platform code editor that is itself based on Electron which is based on 
 Chromium. Visual Studio Code has a growing community and base of installable 
 extensions and themes. It works without too much setup.
 
@@ skipping 26 matching lines @@
     "**/.DS_Store": true,
     "**/out": true
   },
   // YCM
   "ycmd.path": "<your_ycmd_path>",
   "ycmd.global_extra_config": 
       "<your_chromium_path>/src/tools/vim/chromium.ycm_extra_conf.py",
   "ycmd.confirm_extra_conf": false,
   "ycmd.use_imprecise_get_type": true,
   // clang-format
-  "clang-format.style": "Chromium",
-  "editor.formatOnSave": true
+  "clang-format.executable": "<your_depot_tools>/clang-format",
+  "clang-format.style": "file"
 }
 ```
 
 ### Install auto-completion engine(ycmd)
 
 ```
 $ git clone https://github.com/Valloric/ycmd.git ~/.ycmd
 $ cd ~/.ycmd
 $ ./build.py --clang-completer
 ```
@@ skipping 19 matching lines @@
 ### Enable Sublime-like minimap
 
 ```
 "editor.minimap.enabled": true,
 "editor.minimap.renderCharacters": false
 ```
 
 ### More
 
 https://github.com/Microsoft/vscode-tips-and-tricks/blob/master/README.md