Fix typos prior to release

Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
diff --git a/doxygen/input/doc_encdec.h b/doxygen/input/doc_encdec.h
index 46fb04f..8c201ed 100644
--- a/doxygen/input/doc_encdec.h
+++ b/doxygen/input/doc_encdec.h
@@ -38,7 +38,7 @@
  * All symmetric encryption algorithms are accessible via the generic cipher layer
  * (see \c mbedtls_cipher_setup()).
  *
- * The asymmetric encryptrion algorithms are accessible via the generic public
+ * The asymmetric encryption algorithms are accessible via the generic public
  * key layer (see \c mbedtls_pk_init()).
  *
  * The following algorithms are provided: