[openssl/openssl] 063cdc: Fix OSSL_PROVIDER_try_load() retain_fallbacks doc

[Duncan Thomson]

  Branch: refs/heads/master
  Home:   https://github.com/openssl/openssl
  Commit: 063cdca61adfd4d418affe850f8bebbf528d05d9
      https://github.com/openssl/openssl/commit/063cdca61adfd4d418affe850f8bebbf528d05d9
  Author: Duncan Thomson <dthomson at esri.com>
  Date:   2023-07-01 (Sat, 01 Jul 2023)

  Changed paths:
    M doc/man3/OSSL_PROVIDER.pod

  Log Message:
  -----------
  Fix OSSL_PROVIDER_try_load() retain_fallbacks doc

CLA: trivial

Reviewed-by: Tom Cosgrove <tom.cosgrove at arm.com>
Reviewed-by: Matt Caswell <matt at openssl.org>
Reviewed-by: Paul Dale <pauli at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/21319)