fix OSSL_STORE man pages

the man pages have lines that contain nothing but whitespace,
clean it up by removing that whitespace
Reviewed-by: NRichard Levitte <levitte@openssl.org>
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1334)

doc/man3/OSSL_STORE_INFO.pod

@@ -16,7 +16,7 @@ OSSL_STORE_INFO_new_CRL - Functions to manipulate OSSL_STORE_INFO objects
 =head1 SYNOPSIS
 
  #include <openssl/store.h>
- 
+
  typedef struct ossl_store_info_st OSSL_STORE_INFO;
 
  int OSSL_STORE_INFO_get_type(const OSSL_STORE_INFO *store_info);

doc/man3/OSSL_STORE_LOADER.pod

@@ -52,7 +52,7 @@ unregister STORE loaders for different URI schemes
  int OSSL_STORE_LOADER_set_close(OSSL_STORE_LOADER *store_loader,
                                  OSSL_STORE_close_fn store_close_function);
  void OSSL_STORE_LOADER_free(OSSL_STORE_LOADER *store_loader);
- 
+
  int OSSL_STORE_register_loader(OSSL_STORE_LOADER *loader);
  OSSL_STORE_LOADER *OSSL_STORE_unregister_loader(const char *scheme);
 

doc/man3/OSSL_STORE_open.pod

@@ -9,7 +9,7 @@ OSSL_STORE_close - Types and functions to read objects from a URI
 =head1 SYNOPSIS
 
  #include <openssl/store.h>
- 
+
  typedef struct ossl_store_ctx_st OSSL_STORE_CTX;
 
  typedef OSSL_STORE_INFO *(*OSSL_STORE_post_process_info_fn)(OSSL_STORE_INFO *,