Shell script nits (#4982)

programs/bpf/rust/do.sh

@@ -3,19 +3,21 @@
 cd "$(dirname "$0")"
 
 usage() {
-    echo ""
-    echo "  Usage: do.sh action <project>"
-    echo ""
-    echo "  If relative_project_path is ommitted then action will"
-    echo "  be performed on all projects"
-    echo ""
-    echo "  Supported actions:"
-    echo "    build"
-    echo "    clean"
-    echo "    test"
-    echo "    clippy"
-    echo "    fmt"
-    echo ""
+    cat <<EOF
+
+Usage: do.sh action <project>
+
+If relative_project_path is ommitted then action will
+be performed on all projects
+
+Supported actions:
+    build
+    clean
+    test
+    clippy
+    fmt
+
+EOF
 }
 
 perform_action() {