Remove quotes to prevent Markdown from interpreting as Markdown list

README.md

@@ -117,10 +117,13 @@ with that Issue, (3) make changes on that branch, and (4) create a Pull Request
 
 ```mermaid
 flowchart LR
-    a("1. Create issue")
-    b("2. Create branch")
-    c("3. Make changes on branch")
-    d("4. Create pull request")
+    %% Note: The labels are not wrapped in quotes. When wrapped in quotes, GitHub interprets them as
+    %%       Markdown list items, which Mermaid does not allow in its diagrams.
+    %%       Reference: https://github.com/mermaid-js/mermaid/issues/6099
+    a(1. Create issue)
+    b(2. Create branch)
+    c(3. Make changes on branch)
+    d(4. Create pull request)
 
     a --> b --> c --> d
 ```