Fix doc-nits

Remove a space from a whitespace-only line.
Reviewed-by: NRich Salz <rsalz@openssl.org>
Reviewed-by: NRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5575)

doc/man3/OSSL_STORE_expect.pod

@@ -14,7 +14,7 @@ OSSL_STORE_find
  int OSSL_STORE_expect(OSSL_STORE_CTX *ctx, int expected_type);
 
  int OSSL_STORE_supports_search(OSSL_STORE_CTX *ctx, int criterion_type);
- 
+
  int OSSL_STORE_find(OSSL_STORE_CTX *ctx, OSSL_STORE_SEARCH *search);
 
 =head1 DESCRIPTION