Fix some typos

Reported-by: misspell-fixer <https://github.com/vlajos/misspell-fixer>

CLA: trivial

Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/10544)
diff --git a/crypto/asn1_dsa.c b/crypto/asn1_dsa.c
index 972a9eb..34835a5 100644
--- a/crypto/asn1_dsa.c
+++ b/crypto/asn1_dsa.c
@@ -99,7 +99,7 @@
 /*
  * Outputs the DER encoding of a DSA-Sig-Value or ECDSA-Sig-Value to pkt. pkt
  * may be initialised with a NULL buffer which enables pkt to be used to
- * calulate how many bytes would be needed.
+ * calculate how many bytes would be needed.
  *
  * Returns 1 on success or 0 on error.
  */