getting_started_build_tools: dfu-{util,programmer} now available from arch repo

See https://www.archlinux.org/packages/extra/x86_64/dfu-programmer/

docs/getting_started_build_tools.md

@@ -44,9 +44,7 @@ Fedora / Red Hat example:
     
 Arch / Manjaro example:
 
-    pacman -S base-devel gcc unzip wget zip avr-gcc avr-binutils avr-libc dfu-util arm-none-eabi-gcc arm-none-eabi-binutils arm-none-eabi-newlib git
+    pacman -S base-devel gcc unzip wget zip avr-gcc avr-binutils avr-libc dfu-util arm-none-eabi-gcc arm-none-eabi-binutils arm-none-eabi-newlib git dfu-programmer dfu-util
-
-(the `dfu-programmer` package is availble on AUR only so you should download from there or use an AUR helper)
 
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