docs: fix missing backtick in Windows setup commands #4559

This fixes a documentation bug that caused Windows users to encounter
shell syntax errors during local setup. The missing closing backtick
in the echo command was interpreted as an unclosed command
substitution, resulting in:

Error: unexpected EOF while looking for matching `'

Impact: All Windows users following the guide with npm, yarn, pnpm,
bun, or deno would encounter this error.