doc: minor changes

docs/md/config.md

@@ -17,7 +17,6 @@
     * [ENTT_DISABLE_ASSERT](#entt_disable_assert)
   * [ENTT_NO_ETO](#entt_no_eto)
   * [ENTT_STANDARD_CPP](#entt_standard_cpp)
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docs/md/container.md

@@ -9,7 +9,6 @@
 * [Containers](#containers)
   * [Dense map](#dense-map)
   * [Dense set](#dense-set)
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docs/md/graph.md

@@ -14,7 +14,6 @@
   * [Fake resources and order of execution](#fake-resources-and-order-of-execution)
   * [Sync points](#sync-points)
   * [Execution graph](#execution-graph)
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