Fix documentation for some i2d return values.

i2d_XXX_bio and i2d_XXX_fp return either 0 or 1.
Other i2d_XXX functions return the number of bytes or negative on error.

Reviewed-by: Hugo Landau <hlandau@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from #18427)

(cherry picked from commit 943051d)

doc/man3/OSSL_CMP_MSG_get0_header.pod

@@ -118,10 +118,11 @@ d2i_OSSL_CMP_MSG_bio() returns the parsed message or NULL on error.
 OSSL_CMP_MSG_read() and d2i_OSSL_CMP_MSG_bio()
 return the parsed CMP message or NULL on error.
 
-OSSL_CMP_MSG_write() and i2d_OSSL_CMP_MSG_bio() return
-the number of bytes successfully encoded or a negative value if an error occurs.
+OSSL_CMP_MSG_write() returns the number of bytes successfully encoded or a
+negative value if an error occurs.
 
-OSSL_CMP_MSG_update_transactionID() returns 1 on success, 0 on error.
+i2d_OSSL_CMP_MSG_bio() and OSSL_CMP_MSG_update_transactionID() return 1 on
+success, 0 on error.
 
 =head1 SEE ALSO
 

doc/man3/d2i_PrivateKey.pod

@@ -103,14 +103,15 @@ EC_GROUP.
 The d2i_PrivateKey_ex(), d2i_PrivateKey(), d2i_AutoPrivateKey_ex(),
 d2i_AutoPrivateKey(), d2i_PrivateKey_ex_bio(), d2i_PrivateKey_bio(),
 d2i_PrivateKey_ex_fp(), d2i_PrivateKey_fp(), d2i_PublicKey(), d2i_KeyParams()
-and d2i_KeyParams_bio() functions return a valid B<EVP_PKEY> structure or NULL
-if an error occurs. The error code can be obtained by calling
-L<ERR_get_error(3)>.
-
-i2d_PrivateKey(), i2d_PrivateKey_bio(), i2d_PrivateKey_fp(), i2d_PublicKey(),
-i2d_KeyParams() i2d_KeyParams_bio() return the number of bytes successfully
-encoded or a negative value if an error occurs. The error code can be obtained
-by calling L<ERR_get_error(3)>.
+and d2i_KeyParams_bio() functions return a valid B<EVP_PKEY> structure or NULL if
+an error occurs. The error code can be obtained by calling L<ERR_get_error(3)>.
+
+i2d_PrivateKey(), i2d_PublicKey() and i2d_KeyParams() return the number of
+bytes successfully encoded or a negative value if an error occurs. The error
+code can be obtained by calling L<ERR_get_error(3)>.
+
+i2d_PrivateKey_bio(), i2d_PrivateKey_fp() and i2d_KeyParams_bio() return 1 if
+successfully encoded or zero if an error occurs.
 
 =head1 SEE ALSO