Fix typos & improve wording in comments

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/include/mbedtls/mbedtls_config.h b/include/mbedtls/mbedtls_config.h
index 70f7270..c8e215b 100644
--- a/include/mbedtls/mbedtls_config.h
+++ b/include/mbedtls/mbedtls_config.h
@@ -2638,7 +2638,7 @@
  *
  * Requires: one of: MBEDTLS_MD5_C, MBEDTLS_RIPEMD160_C, MBEDTLS_SHA1_C,
  *                   MBEDTLS_SHA224_C, MBEDTLS_SHA256_C, MBEDTLS_SHA384_C,
- *                   MBEDTLS_SHA512_C, or MBEDTLS_PSA_CRYPTO_C with a least
+ *                   MBEDTLS_SHA512_C, or MBEDTLS_PSA_CRYPTO_C with at least
  *                   one hash.
  * Module:  library/md.c
  * Caller:  library/constant_time.c
@@ -2850,7 +2850,7 @@
  * Module:  library/pkcs5.c
  *
  * Requires: MBEDTLS_CIPHER_C
- *           (auto-enables MBEDTLS_MD_C)
+ * Auto-enables: MBEDTLS_MD_C
  *
  * \warning If using a hash that is only provided by PSA drivers, you must
  * call psa_crypto_init() before doing any PKCS5 operations.
diff --git a/tests/include/test/psa_crypto_helpers.h b/tests/include/test/psa_crypto_helpers.h
index ed64ed0..6ff235d 100644
--- a/tests/include/test/psa_crypto_helpers.h
+++ b/tests/include/test/psa_crypto_helpers.h
@@ -352,7 +352,7 @@
 /** \def MD_OR_USE_PSA_INIT
  *
  * Call this macro to initialize the PSA subsystem if MD uses a driver,
- * of if #MBEDTLS_USE_PSA_CRYPTO or #MBEDTLS_SSL_PROTO_TLS1_3 is enabled,
+ * or if #MBEDTLS_USE_PSA_CRYPTO or #MBEDTLS_SSL_PROTO_TLS1_3 is enabled,
  * and do nothing otherwise.
  *
  * If the initialization fails, mark the test case as failed and jump to the