Clarify why the implementations of ArduinoBLE_UART_Stream and BluefruitLE_SPI_Stream are in their respective header files

Author: cstawarz

utility/ArduinoBLE_UART_Stream.cpp

@@ -1,3 +1,4 @@
 /*
- * Implementation is in ArduinoBLE_UART_Stream.h to avoid linker issues.
+ * Implementation is in ArduinoBLE_UART_Stream.h to avoid making ArduinoBLE a
+ * build-time dependency for all projects that use the Firmata library.
  */

utility/BluefruitLE_SPI_Stream.cpp

@@ -1,3 +1,5 @@
 /*
- * Implementation is in BluefruitLE_SPI_Stream.h to avoid linker issues.
+ * Implementation is in BluefruitLE_SPI_Stream.h to avoid making
+ * Adafruit_BluefruitLE_nRF51 a build-time dependency for all projects that use
+ * the Firmata library.
  */