Fix additional misspellings found by codespell

Remaining hits seem to be hex data, certificates,
and other miscellaneous exceptions.
List generated by running codespell -w -L
keypair,Keypair,KeyPair,keyPair,ciph,nd

Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index 84c7df8..6acd9b1 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -1914,7 +1914,7 @@
  * unless you know for sure amplification cannot be a problem in the
  * environment in which your server operates.
  *
- * \warning Disabling this can ba a security risk! (see above)
+ * \warning Disabling this can be a security risk! (see above)
  *
  * Requires: MBEDTLS_SSL_PROTO_DTLS
  *