fix typo

jupyter-book/cellular_structure/annotation.ipynb

@@ -1610,7 +1610,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "This dendrogram partly reflects prior knowledge on cell type relations (e.g. B cells largely clustering together), but we also observe some unexpected patterns: Tcm/Naive helper T cells cluster with erythroid cells and macrophages rather than with the other T cells. This is a red flag! Possibly, the Tcm/Naive helper T cell annotation are wrong."
+    "This dendrogram partly reflects prior knowledge on cell type relations (e.g. B cells largely clustering together), but we also observe some unexpected patterns: Tcm/Naive helper T cells cluster with erythroid cells and macrophages rather than with the other T cells. This is a red flag! Possibly, the Tcm/Naive helper T cell annotations are wrong."
    ]
   },
   {