toolchain/toolchain-bare-metal-buildroot: rename example vendor to buildroot

Now that xilinx-embeddedsw is compatible with the toolchain vendor buildroot,
this patch modifies the toolchain-bare-metal-buildroot help example to use
the microblazeel-buildroot-elf tuple.

Signed-off-by: Neal Frager <neal.frager@amd.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>

toolchain/toolchain-bare-metal-buildroot/Config.in

@@ -10,7 +10,7 @@ config BR2_TOOLCHAIN_BARE_METAL_BUILDROOT_ARCH
 
 	  For example, to build both a Microblaze and a RISC-V bare
 	  metal toolchain, use the following definition:
-	  "microblazeel-xilinx-elf riscv32-buldroot-elf"
+	  "microblazeel-buildroot-elf riscv32-buildroot-elf"
 
 source "package/newlib-bare-metal/Config.in"