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 bc3e678..0d6230f 100644
--- a/include/mbedtls/error.h
+++ b/include/mbedtls/error.h
@@ -171,9 +171,9 @@
 }
 
 /**
- * \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
diff --git a/tests/data_files/Makefile b/tests/data_files/Makefile
index e2e4190..f67db07 100644
--- a/tests/data_files/Makefile
+++ b/tests/data_files/Makefile
@@ -1,7 +1,7 @@
 ## This file contains a record of how some of the test data was
 ## generated. The final build products are committed to the repository
 ## as well to make sure that the test data is identical. You do not
-## need to use this makefile unless you're extending mbed TLS's tests.
+## need to use this makefile unless you're extending Mbed TLS's tests.
 
 ## Many data files were generated prior to the existence of this
 ## makefile, so the method of their generation was not recorded.