Fix copypasta punctuation in some function prototypes

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/docs/proposed/psa-driver-interface.md b/docs/proposed/psa-driver-interface.md
index 56e2b29..f28e9a8 100644
--- a/docs/proposed/psa-driver-interface.md
+++ b/docs/proposed/psa-driver-interface.md
@@ -5,7 +5,7 @@
 
 This specification is work in progress and should be considered to be in a beta stage. There is ongoing work to implement this interface in Mbed TLS, which is the reference implementation of the PSA Cryptography API. At this stage, Arm does not expect major changes, but minor changes are expected based on experience from the first implementation and on external feedback.
 
-Time-stamp: "2020/08/19 19:47:39 GMT"
+Time-stamp: "2020/09/18 20:35:28 GMT"
 
 ## Introduction
 
@@ -520,13 +520,13 @@
 ```
 psa_status_t acme_export_key(const psa_key_attributes_t *attributes,
                              const uint8_t *key_buffer,
-                             size_t key_buffer_size);
+                             size_t key_buffer_size,
                              uint8_t *data,
                              size_t data_size,
                              size_t *data_length);
 psa_status_t acme_export_public_key(const psa_key_attributes_t *attributes,
                                     const uint8_t *key_buffer,
-                                    size_t key_buffer_size);
+                                    size_t key_buffer_size,
                                     uint8_t *data,
                                     size_t data_size,
                                     size_t *data_length);