LU-8186 llite: Typo in ll_rw_extents_stats_pp_seq_show

LU-8186 llite: Typo in ll_rw_extents_stats_pp_seq_show

Add a missing quote character to ll_rw_extents_stats_pp_seq_show. Also
correct leading whitespace to match coding guidelines.

This corrects the text displayed on clients in
/proc/fs/lustre/llite/.../extents_stats_per_process

Test-Parameters: trivial
Signed-off-by: Steve Guminski <stephenx.guminski@intel.com>
Change-Id: I3046836372182925ea0f3b0f5909ae7f8dc5efd1
Reviewed-on: http://review.whamcloud.com/23248
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>