Make Documentation Examples Compile (#2310)

* opening and closing links

* sudo example compiles

* add Aura after it was merged to master

* Timestamp doc testing passes

* Timestamp doc testing works, extraneous lines commented out

* balances

* remove extern crate line

* Removed unneeded code snippet from aura

* make consensus compiles

* executive compiles

* cleanup unnecessary lines

* staking (removed examples that are just copies of tests)

* Apply suggestions from code review

* unindent example

substrate/srml/timestamp/src/lib.rs

@@ -57,8 +57,9 @@
 //!
 //! ### Get current timestamp
 //!
-//! ```ignore
-//! use support::{decl_module, dispatch::Result};
+//! ```
+//! use srml_support::{decl_module, dispatch::Result};
+//! # use srml_timestamp as timestamp;
 //! use system::ensure_signed;
 //!
 //! pub trait Trait: timestamp::Trait {}
@@ -72,6 +73,7 @@
 //! 		}
 //! 	}
 //! }
+//! # fn main() {}
 //! ```
 //!
 //! ### Example from the SRML