Fix typos prior to release

Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
diff --git a/include/mbedtls/pkcs7.h b/include/mbedtls/pkcs7.h
index 52895ac..12a9cd6 100644
--- a/include/mbedtls/pkcs7.h
+++ b/include/mbedtls/pkcs7.h
@@ -218,7 +218,7 @@
  * \param hashlen  Length of the hash.
  *
  * \note           This function is different from mbedtls_pkcs7_signed_data_verify()
- *                 in a way that it directly recieves the hash of the data.
+ *                 in a way that it directly receives the hash of the data.
  *
  * \return         A negative error code on failure.
  */