docs - fix broken link in handling_connections.ipynb howto (#969)

docs/howto/handling_connections.ipynb

@@ -64,7 +64,7 @@
     "## Manually\n",
     "\n",
     "In some circumstances, you may want to manage connections manually. To do so you can use \n",
-    "[open_connection](../ref/api/inventory.rst#nornir.core.inventory.Host.open_connection), [close_connection](../ref/api/inventory.rst#nornir.core.inventory.Host.close_connection), [close_connections](../ref/api/inventory.rst#nornir.core.inventory.Host.close_connections) and [Nornir.close_connections](../ref/api/nornir.rst#nornir.core.Nornir.close_connections). For instance:"
+    "[open_connection](../api/nornir/core/inventory.html#nornir.core.inventory.Host.open_connection), [close_connection](../api/nornir/core/inventory.html#nornir.core.inventory.Host.close_connection), [close_connections](../api/nornir/core/inventory.html#nornir.core.inventory.Host.close_connections) and [Nornir.close_connections](../api/nornir/core/__init__.html#nornir.core.__init__.Nornir.close_connections). For instance:"
    ]
   },
   {
@@ -119,7 +119,7 @@
    "source": [
     "## Specifying connection parameters\n",
     "\n",
-    "When using the [open_connection](../ref/api/inventory.rst#nornir.core.inventory.Host.open_connection) you can specify any parameters you want. If you don't, or if you let nornir open the connection automatically, nornir will read those parameters from the inventory. You can specify standard attributes at the object level if you want to reuse them across different connections or you can override them for each connection. For example:"
+    "When using the [open_connection](../api/nornir/core/inventory.html#nornir.core.inventory.Host.open_connection) you can specify any parameters you want. If you don't, or if you let nornir open the connection automatically, nornir will read those parameters from the inventory. You can specify standard attributes at the object level if you want to reuse them across different connections or you can override them for each connection. For example:"
    ]
   },
   {