Fixed minor typo in the req.pod docs
Fixed minor typo in the req.pod docs

CLA: Trivial

Fixes #7928.

Reviewed-by: Paul Yang <cad61ddf4788d12607a026a313663800394626e7@baishancloud.com>
Reviewed-by: Viktor Dukhovni <86faeb3e05561b856666236e198c27e698275e82@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/7973)

openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl