docs: filesystems: ensure proc pid substitutable is complete

The entry in proc.rst for 3.14 is missing the closing ">" of the "pid"
field for the ksm_stat file. Add this for both the table of contents and
the actual header for the "ksm_stat" file.

Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Thomas Böhler <witcher@wiredspace.de>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20260131-ksm_stat-v2-1-a8fea12d604e@wiredspace.de>

Author: Witcher01

Documentation/filesystems/proc.rst

@@ -48,7 +48,7 @@ fixes/update part 1.1  Stefani Seibold <stefani@seibold.net>    June 9 2009
   3.11	/proc/<pid>/patch_state - Livepatch patch operation state
   3.12	/proc/<pid>/arch_status - Task architecture specific information
   3.13  /proc/<pid>/fd - List of symlinks to open files
-  3.14  /proc/<pid/ksm_stat - Information about the process's ksm status.
+  3.14  /proc/<pid>/ksm_stat - Information about the process's ksm status.
 
   4	Configuring procfs
   4.1	Mount options
@@ -2289,8 +2289,8 @@ The number of open files for the process is stored in 'size' member
 of stat() output for /proc/<pid>/fd for fast access.
 -------------------------------------------------------
 
-3.14 /proc/<pid/ksm_stat - Information about the process's ksm status
----------------------------------------------------------------------
+3.14 /proc/<pid>/ksm_stat - Information about the process's ksm status
+----------------------------------------------------------------------
 When CONFIG_KSM is enabled, each process has this file which displays
 the information of ksm merging status.