updated link for example module in template (#2020)

substrate/node-template/runtime/src/template.rs

@@ -6,7 +6,7 @@
 
 
 /// For more guidance on Substrate modules, see the example module
-/// https://github.com/paritytech/substrate/blob/gav-template/srml/example/src/lib.rs
+/// https://github.com/paritytech/substrate/blob/master/srml/example/src/lib.rs
 
 use support::{decl_module, decl_storage, decl_event, StorageValue, dispatch::Result};
 use system::ensure_signed;