Update gfx-hal to wgpu-hal (#350)

Author: spencer-lunarg

chapters/portability_initiative.adoc

@@ -33,7 +33,7 @@ image::{images}portability_initiative_macos.png[portability_initiative_macos.png
 
 == gfx-rs
 
-Mozilla is currently helping drive link:https://github.com/gfx-rs/portability[gfx-rs portability] to use link:https://gfx-rs.github.io/2017/07/24/low-level.html[gfx-hal] as a way to interface with various other APIs.
+Mozilla is currently helping drive link:https://github.com/gfx-rs/portability[gfx-rs portability] to use link:https://github.com/gfx-rs/wgpu/pull/1471[wgpu-hal] as a way to interface with various other APIs.
 
 image::{images}portability_initiative_gfxrs.png[portability_initiative_gfxrs.png]
 

lang/jp/chapters/portability_initiative.adoc

@@ -31,6 +31,6 @@ image::../../../chapters/images/portability_initiative_macos.png[portability_ini
 
 == gfx-rs
 
-現在、Mozilla は link:https://github.com/gfx-rs/portability[gfx-rs の移植性]を推進しており、link:https://gfx-rs.github.io/2017/07/24/low-level.html[gfx-hal] を他のさまざまなAPIとのインターフェイスとして使用しています。
+現在、Mozilla は link:https://github.com/gfx-rs/portability[gfx-rs の移植性]を推進しており、link:https://github.com/gfx-rs/wgpu/pull/1471[wgpu-hal] を他のさまざまなAPIとのインターフェイスとして使用しています。
 
 image::../../../chapters/images/portability_initiative_gfxrs.png[portability_initiative_gfxrs.png]

lang/kor/chapters/portability_initiative.adoc

@@ -35,7 +35,7 @@ image::../../../chapters/images/portability_initiative_macos.png[portability_ini
 
 == gfx-rs
 
-현재 Mozilla는 link:https://github.com/gfx-rs/portability[gfx-rs 이식성]을 추짛나고 있으며 link:https://gfx-rs.github.io/2017/07/24/low-level.html[gfx-hal]를 다른 다양한 API와의 인터페이스로 사용하고 있습니다.
+현재 Mozilla는 link:https://github.com/gfx-rs/portability[gfx-rs 이식성]을 추짛나고 있으며 link:https://github.com/gfx-rs/wgpu/pull/1471[wgpu-hal]를 다른 다양한 API와의 인터페이스로 사용하고 있습니다.
 
 image::../../../chapters/images/portability_initiative_gfxrs.png[portability_initiative_gfxrs.png]