Shell script nits (#4982)

programs/bpf/rust/do.sh

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