Update manpages

doc/snapraid.txt

@@ -782,7 +782,11 @@ prints its location within the parity file and the number of fragments
 it occupies.
 
 You can use the -t, --tail option to restrict the operation to files
-using only the specified tail portion of the parity.
+occupying the specified tail portion of the parity.
+
+If you want to reallocate these files, you can then use the
+-W, --force-realloc-tail option. Be aware that such files will
+not be protected by parity during the reallocation process.
 
 
 6 OPTIONS
@@ -1006,7 +1010,7 @@ SnapRAID provides the following options:
         tail portion (last SIZE bytes) of each parity file.
         It forces reallocation (movement) of any file fragments/blocks
         currently stored in that tail section, allowing them to be
-        placed anywhere in the parity file where free space is
+        placed anywhere in the parity file(s) where free space is
         available (including existing holes).
         The main purpose of this option is to shrink the on-disk size
         of the parity file. If the reallocation successfully clears
@@ -1014,6 +1018,8 @@ SnapRAID provides the following options:
         parity file is truncated, reclaiming the unused tail space.
         You can use multipliers such as K, M, G, or T (e.g.
         --force-realloc-tail 1G).
+        You can use locate -t, --tail to know in advance the affected
+        files.
         WARNING! This option is for experts only, and it is highly
         recommended not to use it.
         You DO NOT have data protection during the `sync` operation