docs: update the list of build systems, which support uClibc-ng
docs: update the list of build systems, which support uClibc-ng

foss-for-synopsys-dwc-arc-processors/uClibc,brgl/uclibc-ng,wbx-github/uclibc-ng,brgl/uclibc-ng,foss-for-synopsys-dwc-arc-processors/uClibc,kraj/uclibc-ng,kraj/uclibc-ng,kraj/uclibc-ng,brgl/uclibc-ng,foss-for-synopsys-dwc-arc-processors/uClibc,brgl/uclibc-ng,wbx-github/uclibc-ng,wbx-github/uclibc-ng,wbx-github/uclibc-ng,foss-for-synopsys-dwc-arc-processors/uClibc,kraj/uclibc-ng