Fix reversed meaning of error codes

The meaning of the X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY and X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT error codes were still reversed in the X509_STORE_CTX_get_error function documentation.
This used to be the problem also in the verify application documentation, but was fixed on 2010-02-23 in 7d3d1788

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Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/9529)

(cherry picked from commit 6d5aa88d74b67b1bc108e121dea687a4ca67e329)