Update docs related to entry point

Author: GabrielMajeri

BUILDING.md

@@ -18,8 +18,10 @@ The following steps allow you to build a simple UEFI app.
   and make sure you have an entry point function which matches the one below:
 
 ```rust
-#[no_mangle]
-pub extern "C" fn efi_main(handle: Handle, system_table: SystemTable<Boot>) -> Status;
+use uefi::prelude::*;
+
+#[entry]
+fn efi_main(handle: Handle, system_table: SystemTable<Boot>) -> Status;
 ```
 
 - Build using `cargo xbuild --target x86_64-unknown-uefi`.

README.md

@@ -82,19 +82,14 @@ uses UEFI to set up an environment for it.
 
 ## Documentation
 
+The docs for the latest published crate version can be found at
+[docs.rs/uefi/](https://docs.rs/uefi/)
+
 This crate's documentation is fairly minimal, and you are encouraged to refer to
 the [UEFI specification][spec] for detailed information.
 
 [spec]: http://www.uefi.org/specifications
 
-### rustdoc
-
-Use the `build.py` script in the `uefi-test-runner` directory to generate the documentation:
-
-```sh
-./build.py doc
-```
-
 ## Sample code
 
 An example UEFI app is built in the `uefi-test-runner` directory.