To display side by side charts in an Update you will need to start in the desired Update. Start by displaying a single chart. From here, you will want to hover over the existing chart as shown below:
Next, click the 1x2 chart icon as shown above (to the right of down arrow, left of settings gear). After you click the icon the regular chart editor as shown below will appear.
Once you have created or selected your second chart it will display similar to our example below:
Below is an example of how side by side charts display went sent via email. Note: The charts will be in line with the text in email.