Fix typo in mbedtls_pk_can_do_ext() documentation

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/include/mbedtls/pk.h b/include/mbedtls/pk.h
index 57085de..4c9f885 100644
--- a/include/mbedtls/pk.h
+++ b/include/mbedtls/pk.h
@@ -413,7 +413,7 @@
 
 #if defined(MBEDTLS_USE_PSA_CRYPTO)
 /**
- * \brief           Tell if context can do the operation given by PSA algorighm
+ * \brief           Tell if context can do the operation given by PSA algorithm
  *
  * \param ctx       The context to query. It must have been initialized.
  * \param alg       PSA algorithm to check against, the following are allowed: