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Add note about Android left button icon constraint (#2963)

Aaron Brager 6 years ago
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      docs/adding-buttons-to-the-navigator.md

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 ##### Android left button
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 ##### Android left button
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 On Android, four button types are supported by default without the need to provide an icon. You can use them by specifying one of the following ids in your left button definition:
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 On Android, four button types are supported by default without the need to provide an icon. You can use them by specifying one of the following ids in your left button definition:
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 * back
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 * back
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 * accept
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 * accept
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 * sideMenu
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 * sideMenu
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+Except for these 4 cases, the left button **must** have an icon on Android. It can't be a text only button.
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 #### Custom Navigation Buttons
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 #### Custom Navigation Buttons
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 On iOS, react-native-navigation uses `UIBarButtonItem` to display all items in the navigation bar. Instead of using images or text for normal `UIBarButtonItem`s, you can supply a custom component to be displayed within a custom view of a `UIBarButtonItem`, using the `component` property when specifying a navigation button.
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 On iOS, react-native-navigation uses `UIBarButtonItem` to display all items in the navigation bar. Instead of using images or text for normal `UIBarButtonItem`s, you can supply a custom component to be displayed within a custom view of a `UIBarButtonItem`, using the `component` property when specifying a navigation button.