COMPMID-1544: Update linux toolchains in doxygen

Change-Id: I530ca49df8476ee351637f7310118276a52acb13
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/145832
Tested-by: Jenkins <bsgcomp@arm.com>
Reviewed-by: Isabella Gottardi <isabella.gottardi@arm.com>
diff --git a/docs/00_introduction.dox b/docs/00_introduction.dox
index 554a5d0..e3bbea2 100644
--- a/docs/00_introduction.dox
+++ b/docs/00_introduction.dox
@@ -724,9 +724,8 @@
 
 For Linux, the library was successfully built and tested using the following Linaro GCC toolchain:
 
- - gcc-linaro-arm-linux-gnueabihf-4.9-2014.07_linux
+ - gcc-linaro-4.9-2016.02-x86_64_arm-linux-gnueabihf
  - gcc-linaro-4.9-2016.02-x86_64_aarch64-linux-gnu
- - gcc-linaro-6.3.1-2017.02-i686_aarch64-linux-gnu
 
 To cross-compile the library in debug mode, with NEON only support, for Linux 32bit: