Remove extraneous newlines from guc_parameters.dat

In commit fce7c73, two unnecessary newlines were kept: before
archive_command and seq_page_cost.  Remove them here just to be
tidier.

Author: Anton Voloshin <a.voloshin@postgrespro.ru>
Discussion: https://www.postgresql.org/message-id/270ae9e7-85c6-487d-b02b-a994af56710b%40postgrespro.ru

Author: petere

src/backend/utils/misc/guc_parameters.dat

@@ -73,7 +73,6 @@
   boot_val => '""',
 },
 
-
 { name => 'archive_command', type => 'string', context => 'PGC_SIGHUP', group => 'WAL_ARCHIVING',
   short_desc => 'Sets the shell command that will be called to archive a WAL file.',
   long_desc => 'An empty string means use "archive_library".',
@@ -2628,7 +2627,6 @@
   boot_val => 'false',
 },
 
-
 { name => 'seq_page_cost', type => 'real', context => 'PGC_USERSET', group => 'QUERY_TUNING_COST',
   short_desc => 'Sets the planner\'s estimate of the cost of a sequentially fetched disk page.',
   flags => 'GUC_EXPLAIN',