doc: updated occurrences of GNU ARM Embedded to GNU Arm Embedded

Updated the doc to use GNU Arm Embedded which is the correct term
according to the official Arm documentation at the time of this commit.

Signed-off-by: Torsten Rasmussen <[email protected]>

Author: tejlmand

doc/getting_started/toolchain_3rd_party_x_compilers.rst

@@ -8,14 +8,14 @@ external organization. Several of these are available.
 
 .. _toolchain_gnuarmemb:
 
-GNU ARM Embedded
+GNU Arm Embedded
 ****************
 
    .. warning::
 
       Do not install the toolchain into a path with spaces.
 
-#. Download and install a `GNU ARM Embedded`_ build for your operating system
+#. Download and install a `GNU Arm Embedded`_ build for your operating system
    and extract it on your file system.
 
    .. note::
@@ -210,6 +210,6 @@ You can build toolchains from source code using crosstool-NG.
       $ echo $XTOOLS_TOOLCHAIN_PATH
       /Volumes/CrossToolNGNew/build/output/
 
-.. _GNU ARM Embedded: https://developer.arm.com/open-source/gnu-toolchain/gnu-rm
+.. _GNU Arm Embedded: https://developer.arm.com/open-source/gnu-toolchain/gnu-rm
 .. _crosstool-ng site: http://crosstool-ng.org
 .. _Arm Compiler 6: https://developer.arm.com/tools-and-software/embedded/arm-compiler/downloads/version-6