shred: update page (#11724)

* shred: update page

Added -v option.
Changed --zero to -z to better match the format of other options.
Added final example combining all of the other options.

---------

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

pages/common/shred.md

@@ -7,14 +7,22 @@
 
 `shred {{path/to/file}}`
 
-- Overwrite a file, leaving zeroes instead of random data:
+- Overwrite a file and show progress on the screen:
+
+`shred --verbose {{path/to/file}}`
+
+- Overwrite a file, leaving [z]eros instead of random data:
 
 `shred --zero {{path/to/file}}`
 
-- Overwrite a file 25 times:
+- Overwrite a file a specific [n]umber of times:
 
-`shred -n25 {{path/to/file}}`
+`shred --iterations {{25}} {{path/to/file}}`
 
 - Overwrite a file and remove it:
 
 `shred --remove {{path/to/file}}`
+
+- Overwrite a file 100 times, add a final overwrite with [z]eros, remove the file after overwriting it and show [v]erbose progress on the screen:
+
+`shred -vzun 100 {{path/to/file}}`