[openssl/openssl] 041489: BIO_read.pod: fix small typo

[Andrea Pappacoda]

  Branch: refs/heads/master
  Home:   https://github.com/openssl/openssl
  Commit: 0414899887b98f973067f286ac126d8b529873e3
      https://github.com/openssl/openssl/commit/0414899887b98f973067f286ac126d8b529873e3
  Author: Andrea Pappacoda <andrea at pappacoda.it>
  Date:   2023-01-31 (Tue, 31 Jan 2023)

  Changed paths:
    M doc/man3/BIO_read.pod

  Log Message:
  -----------
  BIO_read.pod: fix small typo

Add missing `I` to `<b>`

CLA: trivial

Reviewed-by: Hugo Landau <hlandau at openssl.org>
Reviewed-by: Tomas Mraz <tomas at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/20169)