Amend gclient usage in linux readme

Author: JoshuaBehrens

README.Linux.md

@@ -89,10 +89,12 @@ git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
 export PATH=`pwd`/depot_tools:"$PATH"
 
 # Download v8
-fetch v8
+fetch --nohooks --no-history v8
+gclient sync -D --no-history
 cd v8
 
 # (optional) If you'd like to build a certain version:
+git fetch --tag origin refs/tags/12.0.267.36
 git checkout 12.0.267.36
 gclient sync -D