DOCS-1296 correcting file extensions

Author: Sam Kleinman

source/tutorial/backup-databases-with-filesystem-snapshots.txt

@@ -177,7 +177,7 @@ archives the data from the snapshot:
 .. code-block:: sh
 
    umount /dev/vg0/mdb-snap01
-   dd if=/dev/vg0/mdb-snap01 | gzip > mdb-snap01.tar.gz
+   dd if=/dev/vg0/mdb-snap01 | gzip > mdb-snap01.gz
 
 The above command sequence does the following:
 
@@ -204,7 +204,7 @@ sequence of commands:
 .. code-block:: sh
 
    lvcreate --size 1G --name mdb-new vg0
-   gzip -d -c mdb-snap01.tar.gz | dd of=/dev/vg0/mdb-new
+   gzip -d -c mdb-snap01.gz | dd of=/dev/vg0/mdb-new
    mount /dev/vg0/mdb-new /srv/mongodb
 
 The above sequence does the following:
@@ -266,9 +266,9 @@ Consider the following procedure:
 .. code-block:: sh
 
    umount /dev/vg0/mdb-snap01
-   dd if=/dev/vg0/mdb-snap01 | ssh [email protected] gzip > /opt/backup/mdb-snap01.tar.gz
+   dd if=/dev/vg0/mdb-snap01 | ssh [email protected] gzip > /opt/backup/mdb-snap01.gz
    lvcreate --size 1G --name mdb-new vg0
-   ssh [email protected] gzip -d -c /opt/backup/mdb-snap01.tar.gz | dd of=/dev/vg0/mdb-new
+   ssh [email protected] gzip -d -c /opt/backup/mdb-snap01.gz | dd of=/dev/vg0/mdb-new
    mount /dev/vg0/mdb-new /srv/mongodb
 
 .. _backup-without-journaling: