Update power-bi-visual-add-bubble-layer.md

Fixes a typo in the Bubble layer description by correcting "be default" to "by default".

Author: c0deb00k

articles/azure-maps/power-bi-visual-add-bubble-layer.md

@@ -20,7 +20,7 @@ Initially all bubbles have the same fill color. If a field is passed into the **
 
 :::image type="content" source="./media/power-bi-visual/bubble-layer-with-legend-color.png" lightbox="./media/power-bi-visual/bubble-layer-with-legend-color.png"alt-text="A map displaying point data using the bubble layer, the bubbles are colored based on their categorization with a legend showing what color is associated with which business.":::
 
-The outline of the bubbles is white be default but can be changed to a new color or by enabling the high-contrast outline option. The **High-contrast outline** option dynamically assigns an outline color that is a high-contrast variant of the fill color. This helps to ensure the bubbles are clearly visible regardless of the style of the map. The following are the primary settings in the **Format** pane that are available in the **Bubble layer** section.
+The outline of the bubbles is white by default but can be changed to a new color or by enabling the high-contrast outline option. The **High-contrast outline** option dynamically assigns an outline color that is a high-contrast variant of the fill color. This helps to ensure the bubbles are clearly visible regardless of the style of the map. The following are the primary settings in the **Format** pane that are available in the **Bubble layer** section.
 
 | Setting        | Description    |
 |----------------|----------------|