Improve wording in documentation and ChangeLog
diff --git a/tests/suites/helpers.function b/tests/suites/helpers.function
index 9aecbb1..c77231d 100644
--- a/tests/suites/helpers.function
+++ b/tests/suites/helpers.function
@@ -185,10 +185,10 @@
* expected failure. If MBEDTLS_CHECK_PARAMS is not enabled, no test
* can be made.
*
- * This macro is intended to test that function that return void
+ * This macro is intended to test that functions returning void
* accept all of the parameter values they're supposed to accept - eg
* that they don't call MBEDTLS_PARAM_FAILED() when a parameter
- * that's allowed to be NULL happends to be NULL.
+ * that's allowed to be NULL happens to be NULL.
*
* Note: for functions that return something other that void,
* checking that they accept all the parameters they're supposed to