docs: fix duplicate word and typo in community_edge_betweenness docstring

src/igraph/community.py

@@ -246,14 +246,14 @@ def _community_edge_betweenness(graph, clusters=None, directed=True, weights=Non
       practically defines the "level" where we "cut" the dendrogram to
       get the membership vector of the vertices. If C{None}, the dendrogram
       is cut at the level that maximizes the modularity when the graph is
-      unweighted; otherwise the dendrogram is cut at at a single cluster
+      unweighted; otherwise the dendrogram is cut at a single cluster
       (because cluster count selection based on modularities does not make
       sense for this method if not all the weights are equal).
     @param directed: whether the directionality of the edges should be
       taken into account or not.
     @param weights: name of an edge attribute or a list containing
       edge weights. Higher weights indicate stronger connections.
-    @return: a L{VertexDendrogram} object, initally cut at the maximum
+    @return: a L{VertexDendrogram} object, initially cut at the maximum
       modularity or at the desired number of clusters.
     """
     merges, qs = GraphBase.community_edge_betweenness(graph, directed, weights)