Fix platform setup/teardown feature and comments

Fixed the platform setup/teardown feature, by fixing it for doxygen and adding it
as a feature  in 'version_features.c'.
diff --git a/library/version_features.c b/library/version_features.c
index 9f97c7b..bb172f2 100644
--- a/library/version_features.c
+++ b/library/version_features.c
@@ -69,6 +69,9 @@
 #if defined(MBEDTLS_PLATFORM_NV_SEED_ALT)
     "MBEDTLS_PLATFORM_NV_SEED_ALT",
 #endif /* MBEDTLS_PLATFORM_NV_SEED_ALT */
+#if defined(MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT)
+    "MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT",
+#endif /* MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT */
 #if defined(MBEDTLS_DEPRECATED_WARNING)
     "MBEDTLS_DEPRECATED_WARNING",
 #endif /* MBEDTLS_DEPRECATED_WARNING */