Move "internal use" sentence attached to the wrong function

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/include/mbedtls/sha512.h b/include/mbedtls/sha512.h
index 9ff78ec..5e5a15e 100644
--- a/include/mbedtls/sha512.h
+++ b/include/mbedtls/sha512.h
@@ -152,8 +152,7 @@
 
 /**
  * \brief          This function finishes the SHA-512 operation, and writes
- *                 the result to the output buffer. This function is for
- *                 internal use only.
+ *                 the result to the output buffer.
  *
  * \param ctx      The SHA-512 context. This must be initialized
  *                 and have a hash operation started.
@@ -169,6 +168,7 @@
 /**
  * \brief          This function processes a single data block within
  *                 the ongoing SHA-512 computation.
+ *                 This function is for internal use only.
  *
  * \param ctx      The SHA-512 context. This must be initialized.
  * \param data     The buffer holding one block of data. This