fix compile error in example init comment

Author: lrvideckis

library/graphs/bridges_cuts/block_vertex_tree.hpp

@@ -9,8 +9,7 @@
 //!   }
 //!   vector<basic_string<array<int, 2>>> adj(n);
 //!   auto [num_bccs, bcc_id, is_cut] = cuts(adj, m);
-//!   auto bvt = block_vertex_tree(adj,
-//!     num_bccs, bcc_id);
+//!   auto bvt = block_vertex_tree(adj, num_bccs, bcc_id);
 //!
 //!   //to loop over each unique bcc containing a node u:
 //!   for (int bccid : bvt[v]) {

library/graphs/bridges_cuts/bridge_tree.hpp

@@ -9,8 +9,7 @@
 //!   }
 //!   vector<basic_string<array<int, 2>>> adj(n);
 //!   auto [num_ccs, br_id, is_br] = bridges(adj, m);
-//!   vector<vi> bt = bridge_tree(adj,
-//!     num_ccs, br_id, is_br);
+//!   auto bt = bridge_tree(adj, num_ccs, br_id, is_br);
 //! @endcode
 //! @time O(n + m)
 //! @space O(n)