Documentation: openrisc: Update toolchain binaries URL

The old development toolchain binaries were hosted in the or1k-gcc
development github repo release page.  However, now that we have all
code upstream I cut releases from stable upstream tarballs.  It does not
make sense to tag the or1k-gcc github repo releases for these stable
releases.

Update the toolchain binaries URL to point to where they are now hosted
on the or1k-toolchain-build github release page.

Signed-off-by: Stafford Horne <shorne@gmail.com>

Author: stffrdhrn

Documentation/arch/openrisc/openrisc_port.rst

@@ -27,11 +27,11 @@ Toolchain binaries can be obtained from openrisc.io or our github releases page.
 Instructions for building the different toolchains can be found on openrisc.io
 or Stafford's toolchain build and release scripts.
 
-	==========	=================================================
-	binaries	https://github.com/openrisc/or1k-gcc/releases
+	==========	==========================================================
+	binaries	https://github.com/stffrdhrn/or1k-toolchain-build/releases
 	toolchains	https://openrisc.io/software
 	building	https://github.com/stffrdhrn/or1k-toolchain-build
-	==========	=================================================
+	==========	==========================================================
 
 2) Building
 

Documentation/translations/zh_CN/arch/openrisc/openrisc_port.rst

@@ -36,11 +36,11 @@ OpenRISC工具链和Linux的构建指南
 工具链的构建指南可以在openrisc.io或Stafford的工具链构建和发布脚本
 中找到。
 
-	======      =================================================
-	二进制      https://github.com/openrisc/or1k-gcc/releases
+	======      ==========================================================
+	二进制      https://github.com/stffrdhrn/or1k-toolchain-build/releases
 	工具链      https://openrisc.io/software
 	构建        https://github.com/stffrdhrn/or1k-toolchain-build
-	======      =================================================
+	======      ==========================================================
 
 2) 构建
 

Documentation/translations/zh_TW/arch/openrisc/openrisc_port.rst

@@ -36,11 +36,11 @@ OpenRISC工具鏈和Linux的構建指南
 工具鏈的構建指南可以在openrisc.io或Stafford的工具鏈構建和發佈腳本
 中找到。
 
-	======      =================================================
-	二進制      https://github.com/openrisc/or1k-gcc/releases
+	======      ==========================================================
+	二進制      https://github.com/stffrdhrn/or1k-toolchain-build/releases
 	工具鏈      https://openrisc.io/software
 	構建        https://github.com/stffrdhrn/or1k-toolchain-build
-	======      =================================================
+	======      ==========================================================
 
 2) 構建