docs: point groove CLI install hint at hyperpolymath/groove-protocol (#221)

Companion to hyperpolymath/standards#228.
Updates the single line in `scripts/fix-missing-groove.sh` that
referenced `standards/groove-protocol/cli` to use the new top-level
repo's install command.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: hyperpolymath <hyperpolymath@users.noreply.github.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

scripts/fix-missing-groove.sh

@@ -10,7 +10,7 @@
 #
 # Usage: fix-missing-groove.sh <repo-path> <finding-json>
 #
-# Requires: groove CLI (installed via `cargo install --path standards/groove-protocol/cli`)
+# Requires: groove CLI (installed via `cargo install --git https://github.com/hyperpolymath/groove-protocol --path cli`)
 
 set -euo pipefail