Fix a few typos
diff --git a/include/mbedtls/chachapoly.h b/include/mbedtls/chachapoly.h
index 649749a..42b2b23 100644
--- a/include/mbedtls/chachapoly.h
+++ b/include/mbedtls/chachapoly.h
@@ -175,7 +175,7 @@
* The Additional Authenticated Data (AAD), also called
* Associated Data (AD) is only authenticated but not
* encrypted nor included in the encrypted output. It is
- * usually transmitted separately fro mthe ciphertext or
+ * usually transmitted separately from the ciphertext or
* computed locally by each party.
*
* \note This function is called before data is encrypted/decrypted.