More spelling corrections

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/include/mbedtls/error.h b/include/mbedtls/error.h
index 6882d71..a7454f2 100644
--- a/include/mbedtls/error.h
+++ b/include/mbedtls/error.h
@@ -166,9 +166,9 @@
 }
 
 /**
- * \brief Translate a Mbed TLS error code into a string representation,
- *        Result is truncated if necessary and always includes a terminating
- *        null byte.
+ * \brief Translate an Mbed TLS error code into a string representation.
+ *        The result is truncated if necessary and always includes a
+ *        terminating null byte.
  *
  * \param errnum    error code
  * \param buffer    buffer to place representation in