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docs: Update pyb.UART.any() to mention that it returns character count.
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‎docs/library/pyb.UART.rst‎

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@@ -103,7 +103,7 @@ Methods
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.. method:: uart.any()
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Return ``True`` if any characters waiting, else ``False``.
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Returns the number of characters waiting (may be 0).
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.. method:: uart.writechar(char)
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