fix example usage of xMessageBufferCreateStatic and xStreamBufferCrea… (#380)

Example usage is actually correct, so remove the -1. but update
the incorrect parameter description for pucStreamBufferStorageArea
and pucMessageBufferStorageArea.
diff --git a/include/message_buffer.h b/include/message_buffer.h
index b7428ad..c569d63 100644
--- a/include/message_buffer.h
+++ b/include/message_buffer.h
@@ -165,7 +165,7 @@
  * stored in the message buffer is actually (xBufferSizeBytes - 1).

  *

  * @param pucMessageBufferStorageArea Must point to a uint8_t array that is at

- * least xBufferSizeBytes + 1 big.  This is the array to which messages are

+ * least xBufferSizeBytes big.  This is the array to which messages are

  * copied when they are written to the message buffer.

  *

  * @param pxStaticMessageBuffer Must point to a variable of type

@@ -194,8 +194,8 @@
  * {

  * MessageBufferHandle_t xMessageBuffer;

  *

- *  xMessageBuffer = xMessageBufferCreateStatic( sizeof( ucBufferStorage ),

- *                                               ucBufferStorage,

+ *  xMessageBuffer = xMessageBufferCreateStatic( sizeof( ucStorageBuffer ),

+ *                                               ucStorageBuffer,

  *                                               &xMessageBufferStruct );

  *

  *  // As neither the pucMessageBufferStorageArea or pxStaticMessageBuffer

diff --git a/include/stream_buffer.h b/include/stream_buffer.h
index 9d3c953..061f018 100644
--- a/include/stream_buffer.h
+++ b/include/stream_buffer.h
@@ -172,7 +172,7 @@
  * that is greater than the buffer size.

  *

  * @param pucStreamBufferStorageArea Must point to a uint8_t array that is at

- * least xBufferSizeBytes + 1 big.  This is the array to which streams are

+ * least xBufferSizeBytes big.  This is the array to which streams are

  * copied when they are written to the stream buffer.

  *

  * @param pxStaticStreamBuffer Must point to a variable of type

@@ -202,9 +202,9 @@
  * StreamBufferHandle_t xStreamBuffer;

  * const size_t xTriggerLevel = 1;

  *

- *  xStreamBuffer = xStreamBufferCreateStatic( sizeof( ucBufferStorage ),

+ *  xStreamBuffer = xStreamBufferCreateStatic( sizeof( ucStorageBuffer ),

  *                                             xTriggerLevel,

- *                                             ucBufferStorage,

+ *                                             ucStorageBuffer,

  *                                             &xStreamBufferStruct );

  *

  *  // As neither the pucStreamBufferStorageArea or pxStaticStreamBuffer