fix typos

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/tests/data_files/Makefile b/tests/data_files/Makefile
index 38ed038..47370b4 100644
--- a/tests/data_files/Makefile
+++ b/tests/data_files/Makefile
@@ -1000,7 +1000,7 @@
 all_final += ec_bp512_pub.comp.pem
 
 ################################################################
-#### Convert PEM keys in DER format
+#### Convert PEM keys to DER format
 ################################################################
 server1.pubkey.der: server1.pubkey
 	$(OPENSSL) pkey -pubin -in $< -out $@ -outform DER
diff --git a/tests/suites/test_suite_pkwrite.function b/tests/suites/test_suite_pkwrite.function
index fa205ee..7cc845a 100644
--- a/tests/suites/test_suite_pkwrite.function
+++ b/tests/suites/test_suite_pkwrite.function
@@ -8,7 +8,7 @@
     TEST_DER
 } pkwrite_file_format_t;
 
-/* Helper function for removing "\r" chars from a buffer. This i */
+/* Helper function for removing "\r" chars from a buffer. */
 static void fix_new_lines(unsigned char *in_str, size_t *len)
 {
     size_t chars_left;