secure_fw: Fix spelling typos

Signed-off-by: Antonio de Angelis <antonio.deangelis@arm.com>
Change-Id: I58da18eb39f746c169e7e401d921b84e13d70345
diff --git a/secure_fw/partitions/initial_attestation/attest.h b/secure_fw/partitions/initial_attestation/attest.h
index 660075f..4d8212b 100644
--- a/secure_fw/partitions/initial_attestation/attest.h
+++ b/secure_fw/partitions/initial_attestation/attest.h
@@ -49,7 +49,7 @@
  *
  * \param[in]   major_type  Major type of TLV entries to copy
  * \param[out]  ptr         Pointer to the buffer to store the boot data
- * \parma[in]   len         Size of the buffer to store the boot data
+ * \param[in]   len         Size of the buffer to store the boot data
  *
  * \return Returns error code as specified in \ref psa_attest_err_t
  */