add symbol types to the marker style chapter

[chriddyp]

Marker style comes up as the first hit when we search for marker symbol types, but it doesn't have any examples of symbols

[emmanuelle]

As a starting point the code below displays the symbols

import plotly.graph_objects as go
fig = go.Figure()
for i in range(45):
    fig.add_trace(go.Scatter(x=[i], y=[1], 
                             marker_symbol=i, marker_color='black', showlegend=False))
    fig.add_trace(go.Scatter(x=[i], y=[2], 
                             marker_symbol=100 + i, marker_color='black', showlegend=False))
fig.show()

It should be improved though because at the moment this is very ugly :-)

[emmanuelle]

@Mahdis-z @jdamiba is one of you interested in taking this one?

[chriddyp]

An example we used to have and that we previously work shopped: plotly/documentation#16

[emmanuelle]

Also see
https://plot.ly/~etpinard/435/hover-over-the-marker-points-to-see-their-names/#/

[jdamiba]

I'm interested! Always wanted to learn more about styling markers and this will be the perfect opportunity.

[jdamiba]

closed by #2197