DOCS-10386: Corrected mongorestore --archive flag prototype

Signed-off-by: kay <[email protected]>

Author: nlarew

source/includes/options-mongorestore.yaml

@@ -369,7 +369,7 @@ optional: true
 program: mongorestore
 name: archive
 directive: option
-args: <file or null>
+args: <=file|null>
 description: |
   .. versionadded:: 3.2
 
@@ -379,7 +379,7 @@ description: |
   option and the archive filename.
 
   To restore from the standard input, run {{program}} with the
-  ``archive`` option but *omit* the filename.
+  ``--archive`` option but *omit* the filename.
 
   .. note::