Fixed typos in READMEs

To re-create the sample knowledge graph for the year 1913, simply type:

    python main.py -year 1913 -output_path "../output/example_graph_1913.json"

    python main.py -year 1913 -output_path ../output/example_graph_1913.json

If you want to simplify text description nodes, you can set the flag "-text\_node\_simplification\_mode":

    python main.py -year 1913 -output_path "../output/example_graph_1913_simplified.json" -text_node_simplification_mode classifier

    python main.py -year 1913 -output_path ../output/example_graph_1913_simplified.json -text_node_simplification_mode classifier

For the classifier, the more years are used as training data, the better its simplification accuracy becomes.\

You can add more years by simply adding years to the command:

    python main.py -year 1820 1821 1822 -output_path "../output/example_graph_1820-1822.json"

    python main.py -year 1820 1821 1822 -output_path ../output/example_graph_1820-1822.json

To display all available options, type:

After visualization is complete, you can interact with the graph in the following ways to inspect it more closely or to filter out specfic parts:

* **Settings menu** (gear symbol on the top-left):

    * _Enable Physics_: Enables the physics module of _vis.js_, thus makingg the network move around and react to dragging of nodes (Default: false)

    * _Enable Physics_: Enables the physics module of _vis.js_, thus making the network move around and react to dragging of nodes (Default: false)

    * _Lock network_: Other than zooming and dragging nodes, the network becomes unresponsive to user interaction. Ideal when selecting a node and inspecting its connections without accidentally unselecting it. (Default: false) 

    * _Node Types_: Lists all special node types (see below for details) with their associated shape and color. You can highlight each node type individually. Further, you can remove all description nodes.

    * _Minimum count of connections for persons_: see above