Fixes OSCP->OCSP typo in ocsp command line

The existing help text says:

>  -badsig                 Corrupt last byte of loaded OSCP response signature (for test)

but this should be OCSP. This is the only occurrence within the project
of this typo.

CLA: trivial

Signed-off-by: Alexander Scheel <alex.scheel@hashicorp.com>

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Hugo Landau <hlandau@openssl.org>
(Merged from openssl#18684)

apps/ocsp.c

@@ -135,7 +135,7 @@ const OPTIONS ocsp_options[] = {
     {"no_certs", OPT_NO_CERTS, '-',
      "Don't include any certificates in signed request"},
     {"badsig", OPT_BADSIG, '-',
-        "Corrupt last byte of loaded OSCP response signature (for test)"},
+        "Corrupt last byte of loaded OCSP response signature (for test)"},
     {"CA", OPT_CA, '<', "CA certificate"},
     {"nmin", OPT_NMIN, 'p', "Number of minutes before next update"},
     {"nrequest", OPT_REQUEST, 'p',